RIP Headphone users. That audio is crispy and loud!
I love the time management here. I think I would want to have audio-cues for "Potato is about to burn", maybe some bigger font in general.
What I found a little bit too annoying was how the potato's maximum durations were all over the place, maybe increments of 10 (larger potato, slower moving, etc...) would allow me to get a better "Feel" for the timing; similar to playing Arena FPS games and having a sixth sense as to when the powerups would spawn.
C and S are awkward buttons to hit and would also prevent a WASD-key layout; plenty of choices there suggested from others too (ie: mouse switch).
Great work!