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Jellyfish Invaders icon
Possibly abandoned Tested up to 5.4.24 #1 in 8bit

Jellyfish Invaders

Add pixelated pets to your site in the form of funky animated retro space invaders.

Active installs30+10+ tier
Downloads · 30d94▲ +32.4% vs prev. 30d
Rating5/51 reviews
Health score31/100At risk
All-time downloads5KSince Jan 2013
Support resolved—No recent threads
RequiresWP 3.0PHP any
Downloads · 7d11▼ -65.6% week over week
Our verdict

Consider an alternative

Jellyfish Invaders shows warning signs in 2026 — compare the alternatives below before installing. It runs on 30+ sites, is rated 5/5 and was last updated 7 years ago, and scores 31/100 on our health check.

  • Small user base (30+ active installs)
  • Very few reviews so far
  • No update in 6 years
  • Only tested up to WordPress 5.4 (latest is 7.1)

Daily downloads

369Jul 12Aug 25Oct 9
Yesterday3
Daily average (1y)2
Peak day13Sep 30, 2026
Last 12 months802

Download spikes usually follow a new release — each site that auto-updates counts as a download.

Rankings

Where Jellyfish Invaders stands today

WordPress.org search rankings

Live position in the plugin search, top 100
KeywordPositionCompeting pluginsCategory
8bit #4 7 Best 8bit plugins →
animation >100 3,464 Best animation plugins →
retro #64 74 Best retro plugins →
space invaders #1 1 Best space invaders plugins →
visual effect >100 1,286 Best visual effect plugins →

Version adoption

Share of active sites per release.

  • 0.9100.0%

Rating breakdown

★★★★★★★★★★ 5 from 1 reviews

  • 5★100.0%
  • 4★0.00%
  • 3★0.00%
  • 2★0.00%
  • 1★0.00%

About Jellyfish Invaders

From the official readme · v0.9

Description

Your new pixelated pals will randomly fly around, and if you choose, home in
on any mouse clicks. The glowing retro 8bit scan-line effect space invaders
work on most backgrounds but obviously are more suited to a dark theme. It’s
easy to configure the number, size, behaviour and where the invaders appear
through the comprehensive admin control panel.

Demo and more information at the plugin homepage:

http://strawberryjellyfish.com/wordpress-plugins/jellyfish-invaders

Configuring your Invaders

A new settings page will be added to your Admin Appearance section, where you
can change the look and behaviour of your new binary buddies. Here’s an
overview of the available settings:

  • Enable Invaders Turn the invaders off and on. A quick way to
    temporarily disable the invaders without deactivating the plugin.

  • Where to show you can choose either everywhere OR only on individual
    posts or pages. You can use this second option to just show them on your home
    page or a single post for example.

  • **The invaders will look out for a custom field called “jellyfish_invaders”
    on any post or page. If they find one and it has a value of ‘true’ or ‘on’
    they will populate the page.

  • Number of Invaders how many individual space invaders you want, keep
    this number quite low to avoid slowing down your page too much

  • Invader Size size of the invaders

  • Fly Time how long the invaders fly around before pausing in
    milliseconds (1000 = 1 second)

  • Pause Time How long the invaders Pause (or wiggle see below) for
    between flying cycles.

  • Random adds some variation to the time settings so each invader
    acts a little differently.

  • Wiggle Instead of pausing the invaders will do a missile evasive
    wiggle.

  • Attack Mode None, One or All of the invaders will home in on any
    mouse clicks.

By default the invaders will be free to roam randomly around the entire page,
but there are a couple of methods to confine them to specific areas if you wish.

  • Containing Element the invaders will only roam within the element set
    here, normally that’s body (the whole page) but you may enter the id of an
    element on the page to confine them to a specific area. You can see this in
    effect right here where the invaders have been limited to the section at the
    top of the page.

  • Z-Index If you’d like the invaders to hide behind certain layers on
    your page you can set an appropriate z-index here, obviously this setting it
    very dependant on the structure of your WordPress theme.

  • Use Electric Fence Check this option and use the top, left, right
    and bottom options to define a virtual fence that will contain the invaders.
    The values you enter represent pixels position on the entire document. Note,
    this option will override any custom setting for Containing Element.

Installation

Either install and activate the plugin via your WordPress Admin

Or

Extract the zip file and just drop the contents in the wp-content/plugins/ directory of your WordPress installation and then activate the Plugin from
Plugins page.

When first installed the Jellyfish Invaders plugin will show some invaders on
every page of your blog. You can easily change this to your liking by visiting
the setting page, you will find a link to the settings page in the Appearance
menu of your WordPress admin.

Changelog

There should be no issues upgrading from a previous version. Visit the plugin settings page in Admin > Appearance > jellyfish Invaders to configure new options.

0.9

  • Tested up to WordPress 4.0
  • Added Containing Element option: Confine invaders to a specific page element
  • Added Z-index support: Configure invaders z-index for layering in document
  • Updated Admin screen
  • Updated Spritely version

0.8.1

  • changed the way scripts are queued to ensure JavaScript is only included when invaders are actually needed.

0.6

  • Initial release

Full changelog on WordPress.org →

For developers

Is this your plugin? Show off the numbers.

Add a live badge to your site, docs or GitHub README. It updates on its own — no account needed.

Active installs badge Rating badge Health score badge

FAQ

Jellyfish Invaders: quick answers

Straight answers, pulled from live WordPress.org data.

Live data from WordPress.org · checked Oct 10, 2026

Is Jellyfish Invaders free?

Yes. Jellyfish Invaders is free to download and use from the official WordPress.org plugin directory.

Is Jellyfish Invaders safe to use in 2026?

Jellyfish Invaders shows warning signs in 2026 — compare the alternatives below before installing. It runs on 30+ sites, is rated 5/5 and was last updated 7 years ago, and scores 31/100 on our health check.

How many websites use Jellyfish Invaders?

Jellyfish Invaders is active on 30+ WordPress websites and has been downloaded 4,982 times since it launched in January 2013. It was downloaded 94 times in the last 30 days.

Does Jellyfish Invaders work with WordPress 7.1?

Jellyfish Invaders is officially tested up to WordPress 5.4.24, while the latest release is 7.1.3. It may still work, but try it on a staging site first.

When was Jellyfish Invaders last updated?

The latest version, 0.9, was released on April 2, 2020 (7 years ago).

Who makes Jellyfish Invaders?

Jellyfish Invaders is developed and maintained by Strawberry Jellyfish.

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