Great game! I really don't have a lot of criticisms. For a game made in two days, it's as polished as a regular web release!
The sound effects are very juicy and unique. I especially love the pickup sound; unexpected but strangely fitting.
If I have to nitpick: The graphics feel a little drab, I wish they were a little more stylized like your previous games (Space Hummus), but they are currently fine. I also wish that the bullets made different sounds when impacting different types of objects.
There's a typo in the game description: You wrote that the theme is "power is running out" when it's actually "Running out of power."