I think you did a really nice job here! I'm always a sucker for minimalist art styles. Although I think you could have settled on a more consistent theme, the gameplay was fun. And difficult!
Well you see how your title is very round an cartoony compared to the game? The game's graphics don't quite have the same feel to them, and while the vines and the bee both have outlines, the bird doesn't, and neither do the spikes. That's all I meant, some minor graphical things. c: