Nice entry for a first jam! I can see you learned quite a bit. I mean you will eventually improve on Graphics, Audio, and level design with more research, but I enjoyed it for what it was , but just as one general note never make W jump (or have two buttons to jump because if you press both you can jump over the walls XD)
Anyway one thing I do want to mention is I'm going to make a Game Jam Spotlight Video on my favorite games from this jam on my Game Design Analysis Channel Etra Games in a few days! So here's a shameless plug to my Youtube channel if you want to be notified of when the video releases! :