Nice little game! Simple but effective for messing up your brain while playing lol
Here's my feedback, it would be nice if there's a short on-screen text that tells you that you can swap rock/paper/scissor. It took me 3 tries to realized that I can swap (also my fault for not reading the game description and go straight to playing).
Then there's a cheese where you can have one enemy alive on the first wave, and just avoid all the obstacles to easily farm points forever. Maybe adding a timer that forces player to complete the wave will fix that and makes it more challenging as you go to higher wave.
Good work though!