I am working on a good old fashioned robot shooting game for our 2016 Spring Lisp Game Jam: https://itch.io/jam/spring-2016-lisp-game-jam now available in playable alpha on Windows and Linux. (Mac version soon.)
The game is called INV8R: http://dto.itch.io/inv8r
The newest release (v0.4) includes level generation improvements, a new enemy that shoots bouncing blue lasers, and an Oxygen gauge that will kill you if you don't complete the level in time. This is accompanied by color coding and sound effects. Here is a video:
And another nice animated GIF:
I will be updating this Itch devlog with each new release, and would love to hear any feedback you might have. I have 7 days remaining in the game jam, and I'll be putting out 0.5, 0.6, 0.7 until finally 1.0 is submitted for the jam deadline. I'd like to continue developing the game after that time and expand it a bit further.
I'll be hacking some more today on the game and I'll post some other thoughts as well.
I hope you find the Gifs interesting and consider playing the game!
Watch this thread for updates.