Good work on the game.
Here's some problems that I found:
I think it's because of how you implemented the double jump feature, but when I jump and press space without double jump on, the character would freeze in the air for a couple frames, like he had 0 gravity applied. This also happened whenever I attacked in the air.
I could not use the dynamite. I don't know if it's not fully implemented yet, but I pressed every button on the mouse and keyboard and no dynamite were thrown.
Overall this is a very nice first project, congrats. Keep on the grind!