I think when you press R you can not return to the game back, what if i pressed this by mistake what should i do? also try to make a simple interface to tell the user what the buttons of the game do, and i also reached the end of the game but i didn't kill the enemies another thing is what are the rules of the game, maybe you can make a page if the user want to get some info about the game , it will be by clicking on an arrow or button to see the rules and what the buttons do , but amazing job, did you do that with c++ ? i wonder if you have youtube videos about coding because the game is clean :D