Good game, beatiful graphics. I missed some sound effects when the player and enemie shot and when a power up it's colected. The idea of holding the space to move and fastly pressing it to shot was nice.The bug of the music restarting when chose the menu option don't impact the gameplay, but it's good to fix it. And for lest i feel thaat's better don't wait to player release the space to compute the "hold", but look if the space is pressed during x seconds/miliseconds and consider that's a hold.
I would apoligize you a lot if you could give me some feedback for my game: https://itch.io/jam/boundless-game-jam/rate/1104134. But thank you anyway by making your game (it rithym : D)