Tried it in a different browser and it worked! I'll leave my thought
Good job with this, the upgrade system is my favorite thing about this project. Upgrades come quickly and there is a lot of variety which is nice.
If I had to critique something it'd need to be the visuals and the movement. The background, foreground, player and enemies are very visually busy so it can be overwhelming visually. The movement felt really sluggish, some tweaking here could go a long way.
Nice job overall!