The art assets and sounds you have picked work well together. The touch mechanic is interesting. To improve, have a couple tutorial levels to explain/show mechanics like double jump and dash. Furthermore, don't good from an easy level straight into a hard level it's off putting and doesn't allow the player to gain / learn how to play the game. For the saw, give the players a bit more starting space, you can have the camera show the saw and then snap it back to the player.