Something is going wrong between the story and what I can only assume would be the game. It was taking so long I had to force close the browser.
I know you said to expect an unplayable game, however you've given it a go. In your description you explained your awareness of your own lack of skill, but that will only improve with practice. You seem to be basically starting with nothing, so making anything that can run, and can be played is a massive achievement.
To fix the loading issue, you might want to think about the ordering of your logic changing scenes or, if it's all in the same scene, the logic of enabling and disabling the UI. I learned from my second game jam that by leaving out a variable to ensure code runs once, or leaving out the switch of a Boolean that helps to control some piece of logic can make a drastic difference. In the game I made there it created an infinite "jelly" glitch, allowing a player to beat the game (sort of) without exploring or to break the game by spawning so many Jellies that it the game, or computer could not handle it .
With your comment on music, I know exactly how you feel. When I started doing game jams, music was the main thing I felt was letting me down. Since then, when I have some time I have been exploring VST plugins for the DAW I use, watching small tutorials on bits and pieces related to music and generally just making pieces here and there. One of the comments in this jam for my game liked the music, I'm still learning but the effort put in so far seems to be worth it. So my advice on this is look around for a popular music production youtuber or two that can provide general musical advice, and then practice. If you know how to read sheet music, maybe try copying songs (for personal use only) from sheet music into your DAW to help learn how the sounds and movements look between the sheet music and the piano roll in your DAW.