Hey! This game has quite a learning curve, I had a lot of fun. The enemy didn't even have to make a sound for me to jump! I liked how its mechanics were difficult but easy to predict once you play a few times, and searching for keys was satisfying every time. This was well done!
Some suggestions: I noticed that one key was only obtainable from one side of an object (whereas the others could be obtained from any side) and that another key was only obtained if you stood right in front of it (as opposed to the pickup function). Those two things made the game a little frustrating at first. Also, because there was a lot of searching to do I would forget how many keys I had, perhaps you could include a corner visual of an inventory?
Other than that, I love how you designed this game and used the audio. Congrats on your first game jam! (: