Thanks for the feedback!
@Curly: True, they could use a bit more contrast
@Eishiya: Forgot about that, removed those outlines at the top, looks definitely better!
update with both changes:
About the plants, yeah those should be kinda some more leaves or something
i tried to make them more readable
@yrizoud: valid point, i'll keep that in mind when i'll be working on something new. I think i can balance it out with more originality in the gameplay
@questseeker:
Hm that's mostly a style choice, i kinda like the strong contrast you get from having certain areas of your screen covered by black. I really liked the those kind of cave areas in Metroid or Castlevania games (the newer ones).