Hey! I appreciate you trying out my game!
I actually implemented a difficulty ramping, there is a timer on the top right side of the screen and with it the difficulty increases.
Personally, i have not encountered, the enemy hitbox bug, while bug testing my game, so i will definitely look into it!
Sprite overlapping was a major problem for me, but i just couldn't solve and fix it in time.
Thanks for giving a critical review!