This is so incredibly-well-designed, polished, and FUN! I got so much joy out of speeding up both for how much fast and out of control I got, but also for the well-selected sound. I immediately feel like this game is speed-runnable and could quickly evolve into either a strong solo platforming direction or a puzzle-platforming one. I have only one tiny nit, which is that I can't jump with arrow keys, or shrink with a key other than x - which means I'm stuck shrinking and jumping with the same hand and can't multitask--I feel like I could have moved much faster with the other hand controlling shrink. Super fun, hope to see more of this in the future - nicely done!