This was absolutely a blast! I think this was an incredibly clever idea. It rode that edge of extremely challenging but possible. I was able to get nearly all the upgrades, was just down to a couple of speed upgrades before I couldn't go any longer. I think all the game design decisions here were superb. The white/black contrast looked really nice. I thought it was super clever how the shapes shrunk as you took damage. I loved the variety of enemies and upgrades.
It felt really weird and brain splitting switching focus between the left and right side and I'm surprised how quickly I could context switch what I needed to press to move correctly.
Great job. Super impressed.