Kitten Command

Kitten Command is a Mario fangame inspired loosely by Missile Command. You control a cat, wielding a gun, and need to stop agents of the Koopa Kingdom from invading your home! Originally developed as a "Secret Santa" present for someone on MFGG.

You can find downloads bundled with the game's dependencies here (they're too big to be hosted on NCFC):

Click to enlarge.