Such a creative game! It took me a while to figure it out, but I cheesed my way past the levels (long live the spike row). This is so polished, in so many departements it's crazy. The only feedback is that it's a pretty complicated game, for such a cute concept. There are too many choices and options at the start, I would suggest just giving spikes and springs, and adding more stuff the further you get.
That beside, this was amazing, thank you for this game :)