Honestly, I just regret making my game too easy, yet so hard. Mine is a wave based arena shooter, where each wave comes out faster than the last. The beginning is way too easy IMO, but at a certain point becomes literally impossible, as the waves are coming out mere frames after the last. Eventually (I assume anyway) The game just crashes because the time between waves becomes negative.
here it is, in case anyone's interested: https://itch.io/jam/gmtk-2019/rate/462323