I'm overjoyed that you decided to go head first into game jams for your first projects involving game development. Nothing is obviously broken which is good. For something where your jump height is dictated by how fast you are running, I highly recommend having the ability to change the speed you are going - as of right now your only movement speed is flooring it, which works for longer platforms but for a lot of jumps (like the clouds) it can make the controls a bit cumbersome when trying to make it across while avoiding bullets.
If this is your first game and you got it to the point where you were able to make a submission with it on a game jam, that's great! I remember my first few game jams were complete flops and we failed to get submissions in, so keep up that momentum!