Hey, really glad my gameplay was helpful to your development! I completely missed the shop at the main menu lol, it might be a good idea to add it to the menu after losing that way you don't have to go back to the main menu just to go to the shop.
Probably, though the shop's code is held together by hotglue and hope, and the idea of touching it again terrifies me. I'll likely have to redo the shop entirely before I can do that.