I really, really, really liked this!
Great work! The art, audio, sense of urgency, etc was amazing!
And fits the limitation perfectly.
I do kind of wish though that there could be multiple levels, which each level being "Just reachable" if you do it perfectly, give or take 1-2 seconds.. but, then again, it wont really fit the limitation.
If so, that would keep me playing, trying to complete each level.