u can keep the game style but redraw all textures so they are more detailed because rn its a mess. In main menu, u can add a sound playing every time a cursor moves through buttons, maybe change the font everywhere except minecraft thingie and version thingy. I also noticed that when u opening menus and clicking buttons the sound volume is different, f.e when i toggle Vsync its quiter than when i press "Back" button. Also in one place buttons are rounded in other are not fix that too, u could add some paper texture behind game tutorial thing. Maybe add another mechanic so when u lose hearts u gain abilities but when u recover u lose them to balance everything