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The indie game Onslaught arena is FREE today only. It’s available for Mac computers! It’s available at:
I’m not sure what the Chrome Web Store is but you need Chrome to download the game.
I played the online demo a little bit and I have to say it’s damn hard. Super Meat Boy hard. It’s kind of fun though. Old school 8 bit style. It’s free so might as well try it out and delete it later if you don’t like it.