The projectile mechanics is awesome tbh, though I think aiming with the right click was unnecessary. Also, agree with comments below about the coyote time, I can see you added some spare space close to the platform to land on, but in terms of jumping from the platform it doesn't work from what I tried.
And in terms of the gameplay it could be a bit longer. If you make a platform to jump, make it challenging like in "not my nut" game, or if make a cave, make it so the player will want to explore it.
I know your skill, and it shows in details such as shooting and return mechanics.
But again, those just are nitpicks and for the criteria you did a great job with the story and projectiles!