Onslaught Arena rebranded "Super Meat Boy Arena"

Onslaught Arena is an HTML5 browser based game on the Chrome App Store and the Mac App Store, it's a top down arena combat game that normally looks ilke this:

But right now it looks like this:

It's also free right now, where normally it's $2.

Official April 1st PR:

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Onslaught! Arena v1.2.25 is FREE (today only)

Good news, everyone! We just launched a big update to Onslaught! Arena, and to celebrate we're making it FREE for today only in the Chrome Webstore!

Based on market research findings, this update includes the following changes:
Graphics update to make main character more likable.
Title change to something more recognizable.
You die in only one hit (but your game is saved after each wave).

It's normally $1.99, so get it while it's hot! I mean, free and stuff!