First of all I loved the teeth brushing animation, that looks great. The difficulty curve does drop off after a couple teeth fall out, maybe if the decay sped up with less teeth, might've fixed the difficulty balancing. I see you attempted some complex movement too, which is hard to get right but you made it work. Also great use of the theme!
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Thank you! Yeah I realized late in development that I didn't really have a win or lose condition and didn't quite have time to implement it, so I just threw on the survival timer to add some feeling of achievement. If I was gonna development further I'd definitely either increase decay rate as the teeth fall out, or just have a flat loss once a certain number are gone.