In the first stages, I did nudge the probability so that the player almost always gets a heal from being damaged from the previous level. But after the level "Enemy" the buttons are pretty much random, so you are indeed lucky!
Yeah... The brightness thingy was because I did not understand Godot's 2D lighting system. I think I'll use a Clipping mask or convert it to a 2.5D game instead :P
Thank you for playing and for your thoughtful feedback!
(´｡• ᵕ •｡`) ♡