A very well crafted and polished game. I like how you set the tone instanty from the start. That dramatic synth music kicking in, the voice over and then the clean and responsive visuals. I enjoyed slingshotting around the yellow pickups. Very satisfying. After a few upgrades it reminded me of geometry wars with that deformed grid pattern in the background. As for balancing I felt it was a bit easy for me, but for a game jam I think that usually is a good thing.