I played your game (albeit, by myself)! I think your game is really cute and polished for a short game jam. I like the atmosphere created by the visual FX and the music, and I think you emulated the theme well!
As a single player game, it's fun to try and control both guys at once. As a two-player game, I can see this being an interesting match. I like how one player's color can overwrite the other player's color.
At times, I felt like there was a sort of lull, "waiting" for a missile to hit me in a spot that needed color.
If you wanted to add more to it, these are just some suggestions that you can take or leave:
- It might be fun if players could push each other out of the way sometimes (maybe only with a powerup, or maybe only the losing player can).
- Since the game is two-player, you could have a co-op puzzle mode where the players have to create a particular pre-determined or procedural pattern to win the level.
- And I feel like there is some fun to be had with the missiles. Making them homing at particular times might make your gameplay a little more hectic and reactive!
Well done and good luck :)