The first thing that caught my attention were the graphics. Even tho they're pretty simple, I absolutely LOVE how it looks like all sprites were drawn in a piece of paper and digitalized before being added to the game, which I'm really curious to know if they are.
Still on the topic of graphics, I missed some game juice and polish when adding trees. For example, you could've added some particles and other effects whenever the player placed a tree that increased their score. That way the game would be a lot more satisfying to play.
Lastly, it was kinda sad to see how literally nothing happens at the end of the game. I really wish there was a screen where I could see my final score (and maybe my best score too?) with a restart button so I could try again.
Anyways, great entry! It got me surprisingly hooked!