This is a good start for a platformer. I like the mechanics of finding the key to get through the door. My biggest note would be the change it to restart the level when you lose instead of forcing you to restart the whole game, but I think I may have been responsible for that when I was trying to help fix the bugs. I encourage you to keep going with the project and see what you can make. If you need any help on improving this project or on future projects, please email me!