Last Island

Last Island is a wave based survival arcade game.  There's a competition where the first person to beat the game wins $500. 

The competition rules and development of the game are in this YouTube video here:

(Assuming you didn't come here from the YouTube channel)

The game has 50 waves of varying enemies and increasing difficulty. It's not easy and should only be played by people who want a bit of a challenge.

When downloading for windows, the firewall might protect the download, click the more info button and then run anyway for the installer to start.