UI and pixel art is really nice, but bruh why enemies pressing speed is that low? It gives literally 0 difficulty. Also when i press Z button it counts 2 or 3 key pressed. If i press z key 3 times i literally beat enemy %100! If it is some kind of spamming a key game why not using GetKeyDown ? There is some huge coding and difficulty problems here. I am not so sure but if difficulty increases after every enemy you beat, than please make starting difficulty harder. No one is going to play your game if it starts like that. It is like a pixel artist tried to learn coding and it is the first game he made. I just think key press should got counted normally (not 3 times when u press key) and please make that difficulty harder. It is unplayable at that situation.
Edit: Im not sure but i may possibly get the game wrong. Maybe there is a difficulty choose button. I dont remember sawin one.
Edit 2: Well i also realized when u press a key it counts 2 and when u stop holding or pressing a key it counts 1. WHY BRUH??