Hi, sure. In bullet hell games having precise movement is generally really necessary, so instead of using acceleration based movement you should just have the position adjusted by a fixed amount while a button is held. With acceleration if I try to get to a location and let go, I will continue sliding for a small amount of time meaning I may end up sliding into a bullet. Additionally you can add a speed modifier key to reduce your speed when there are many bullets on the screen. Also with acceleration if I need to move quickly to a location there is ramp up time, and in general getting to locations you want to becomes a lot harder. You did a good job with the game putting the movement aside though.