Wow cool idea and really addicting! Would really work well as a mobile game. But i encountered a few problems / have suggestions:
1. Even though you wrote it in the tutorial, i completely forgot that you can press enter to buy upgrades. Maybe make that more clear or have the menu open by standard and the game not pausing when its open.
2. It would be cool if the game in the beginning was really easy, and slowly gets harder, but it is based on rounds, and between the rounds, you can buy upgrades based on coins or something you got from the previous round(s).
3. The moving seems a bit complicated, maybe just make some kind of scrolling (with holding the mouse button down)
4. Improve the UI!
But overall, good submission, placing bees is really satisfying because of the sounds and everything. Also, good job on no lag.
I hope my feedback helped, and it would be nice if you could check out my game too. Thanks! :)