Yes, I'm aware of this problem and it really bugs me. But it's working though! Just hit ENTER after death to restart game :) Thank you so much for review!
So firstly health bar changes orientation with character and player's health bar hides behind enemies. Then you can cancel death animation and even attack when dead. You can some sort of stick to the walls. Options aren't necessary. There is a little field to outplay enemies and it doesn't feel satisfying. Bosses should have some sort of attack cooldowns and move differently. Player's actions are too slow and there should be some fun mechanics e.g. dashing. I enjoyed music during battles and art style. I think you did very well for 1st game, keep it up :D
In this case difficulty selection should affect interval between enemies shoots or/and bullet speed. Jumping dynamics should be the same for each difficulty.
Controls feel a little too clunky and those black holes aren't real obstacles. Enjoyed rain in the background and how you can use your enemies to pass the level.
