Hi! I always like a little more detailed feedback myself. I hope you don't mind.
First of all: It was a really nice game and I enjoyed playing it. So do not take the criticism too seriously.
The graphic and sound design is quite minimalistic, but fits the overall theme of the game quite well. But even with those minimalistic tools you managed to create a pretty good feeling. Small details like the dust particles when turning the character help tremendously. The music sounds like a mix of Professor Layton and Harry Potter.
The shooting system ist good, but sometimes the projectiles get a little lost. By this I mean that the projectiles fly in circles around the target without actually hitting it. It is more of a side issue because the game is not that hard, but it felt wrong to me.
The biggest issue for me is the jumping part. I'm not sure whether I like it or not. Don't get me wrong: it's not bad, but it feels more like "Flappy bird" to me. I personally prefer higher jumps. However, the ground detection is somewhat buggy. The triple jump resets upon touching the side of a platform. This allowed me to skip the entire first level in my first playthrough. If I had to guess, I would say you are using "OnCollisonEnter" to detect if the player is grounded. The problem is that the colliders of the player and the platform itself detect collisions on the side of the collider as well. I would use a small, downward facing "CircleCast" or a separate, slightly smaller collider on a child object of the player. But that's just my guess.
I hope you can do something with the feedback.
(>^-^)>