Fun game, I like the concept of the surroundings being black and white with every wave spreading colour around, but here are my criticisms of it:
1. The options screen has white letters over an extremely white background. I could barely read anything on there.
2. The bee could jump but there wasn't any purpose to that.
3. There wasn't really any variety in the enemies other than their speed. And it's a really simple fix. Have the standard enemy, then the bear would be slower but take more than 1 hit to kill, and another enemy who attacks from high up, which would make you have to fly to get to it.
4. The ui of the game wasn't very clear on what it did. There is the bar on the bottom of the screen and the bar on top of the plant. I assume the plant one is its health but since everything was white i couldn't really see how much health it had left. I have no idea what the other bar does either.
5. The final cutscene has some weird colours (white grass for example) and a bit too brightness.
6. Finally, the soundtrack is pretty good, but i think the drum section comes in a bit too suddenly.