Just finished playing your game, well done! The art especially looks absolutely stunning, and especially for coding for 5 days that's very impressive!
So in terms of bugs, after one of the first bigger jumps (the one after the overhang with two skeletons in it, pretty close to the beginning) you can fall down and fall out of the map and need to restart. Next to that the flying enemies are a bit hard to attack as they attack just a bit too fast for you to get a hit in.
What I do think you should really add is a credit section/assets used section to the game page. The art is stunning, but it would be good to give proper credit to the artist that made the assets you used, like the player skeleton. That way, they can continue making amazing assets that everyone can use! :)
Again, well done and congrats on your first game jam!