For a game jam this is a really solid game. Great 8bit graphics and sound feel. Feels like I game I would have played on the NES.
It took me a bit to realize that the second "level" after the tutorial was actually the level select. I also had issue with the wall jump but that may just be me and perhaps it would be easier to play with a controller.
One small "bug" I found on the main screen is that if you press up while exit is highlighted you skip credits and the next item highlighted is options.