Impressive amount of functionality with the shop, achievements, levels and all. As mentioned before me, not much punishment from driving into monkeys to keep them away from truck-kun. Sometimes even got into a loop of taking hits by being sandwiched between them.
Shop only displayed upgrade prices after clicking the buy button the first time- a bit odd.
From an art perspective, the pixels being different size in different parts of the game was a big oopsie, but understandable with the time constraint.
All in all, a good idea, great use of theme. Good luck!