Thanks! It's great to hear that the movement works well for you!
Strange that you couldn't hear the menu music though. I know when I was testing it, the engine's remote debug had a issue where the menu music wouldn't play when the game loads, but that bug seemed to vanish when I uploaded it to itch, so it could be a browser specific issue. If you don't mind, try reopening the game, and either go into the shop or start the game and then return to the menu, that seemed to fix it in the engine. I'll test the game on a few different browsers to see if it's an issue with any of them. It could also be that the ambient background was drowning out the music. There's separate volume sliders in the options menu for both background and music volume in case that was the issue.
I'm also thinking of making a post-jam update with more content. I've already started debugging some of the issues with the current version, but there are also scrapped mechanics and new ideas that I'm tempted to implement. For example, there's an entire boss fight mechanic that I had to scrap due to time and technical constraints. And I could also add an option to switch to autofire (or make it an upgrade).