Pita tileset it's amazing. And this game idea it's nice. I dont pretend to be rude but:
It's a shame the rest of graphics doesn't match at all. Also the menu and ui dessign feels confusing and overcomplicated.
I think if you with several graphists it's important to coordine them so the final product has some coherence.
Maybe I'm an old graphist, and younger people doesn't notice or mind these things, but when I see a pixel art game, different pixel sizes in game and ui/menus feels so amateur to me.