The music is great, the death sfx is a bit too loud. The movement is too fast. The jump is too high and fast maybe. If you want to simulate low gravity just lower the gravity. If you want to simulate a jetpack make a small constant force upwards until you want it to stop. The player get stuck to the wall if i am pressing the arrow that let me bump to the wall, this is a classic unity physics problem because of friction, it is easily solvable by making friction 0. Otherwise, great art and music.