Love the visuals in this game. The post processing you used really made this game pop, and the audio and camera shake added to it as well. Just a really clean, polished game, especially for being done in 3 hours!
The controls felt a little wonky to me. I wasn't really expecting a game that looked like this to have only 4 directions of movement rather than floaty, spaceship like movement. Having the bullets go exactly to the mouse position rather than just in the direction of the mouse took some getting used to as well.
This game definitely has potential for a full game to be built around it, rather than just some boss fights! Awesome job!