What are the rules? I have rock/paper/scissors and the enemies are geometric shapes?
So my first feedback is that the looks good and the controls are robust.
Now, the idea of calling it rock paper scissors without having an “A beats B” mechanic is confusing and disorienting to players. I expected to fire the rock at something scissors shaped LOL.
One thing I would change is letting a player click anywhere on the line, pull and fire the projectile from there cause it would be more fun.
It did feel more like Angry Birds so part of me was expecting enemies to sit around and wait for me to launch stuff at them and then have some kinds of physics based destruction.
The projectile (bouncing) and enemy state behavior (stunned/flashing) is solid. It is easy to see you are skilled. Good work!