Really enjoyed this! The central mechanic makes for some interestingly-timed-runs, and most of all, the main soundtrack was an absolute BOP that I could listen to forever. My only feedback is I felt some of the timings had either too much waiting time between the next available action (i.e. waiting to shrink before jumping through a gap) or too narrow of a gap (i.e. I wait too long and now I'm too small to make a jump). Slightly tuned/more generous timings would help, and/or the ability to speed up my shrinking could be fun. Overall nicely done!