I really like this game! It's easy to pickup, simple to learn, and fast paced.
However, the limited ammo ruined the fun for me a few times. Whenever I ran out of bullets, I was forced to run around the room chased by mobs of enemies without any way to retaliate. I did notice that this issue was more pronounced if I skipped the tutorial (a bug perhaps?)
Other than that, I love the music and the way the game incorporates the light vs dark theme: You use light bullets to hurt 'dark' enemies, and dark bullets to hurt 'light' enemies. It's straightforward and easy to understand.
The bloom effect, while it adds multiple shades of gray, I would still accept as 1 bit as It gives it a look similar to classic arcade games. Unfortunately, the game does use some solid grays to create faded out graphics like the letters in the tutorial room.