Hey, well done on the game! The concept for the game was quite funny, but also really well presented. The simple shading style on the models looked pretty nice, and I like that the overall world wasn't overly complicated and drew attention to the tree as the centerpiece of the game. The audio was also hilarious, did get a chuckle out of the Wilhelm scream in there.
I enjoyed how you were able to continue placing down plants as the round progressed to deal with the concentrated areas in the waves, though it seemed like maybe the tree should grow at the end of the round and not the beginning? Felt a bit odd to introduce new placement spots after spending the preparation time placing stuff down, though I suppose those new areas could be used to place things during the wave.
I'll also throw out kudos for the user interface - the art for it is great and thematic to the rest of the game. Good job!