Animations and sound effect are the biggest improvements it can have but other than that just quality of life improvements like options menu, pause menu or something that will give the game some life like upgrades!
I had sound effects at the end of my to-do list and didn't get into it in time, but I totally know what you mean. Beside that, I agree with everything else. I didn't plan on any menus to begin with because I felt it'd be too much, but looking back it may be too little.
