love the skull. these all look tasty except maybe the green and black ones... ominous vibes...

edit: if the light and dark blue have different enough effects (i.e. one isn't just a stronger version of the other) i'd maybe make one have a very different shape? like a diamond or triangle? idk not a big deal

Really cool. I love those colours and I love the sprites. The mechanics and ideas you can do with that sound really cool as well! :)