I resurrected Mooncer!! Overall, fun game. I think the only major issue, as many others pointed out, was the interface. Having a progress bar or count of how many parts you've collected plus how much are left needed to resurrect Mooncer would've been nice, I kinda just navigated through every part of the maze to make sure I wasn't missing anything before moving to the next part, without fighting any of the enemies to save time.
Also as Lloyd Garmadon mentioned with the hearts, at first I wasn't able to notice as I collected them since my eyes were busy navigating the maze and that health bar is pretty small, but when I focused on it I was able to tell an amount was increased when the hearts were collected. Making the health bar bigger would help for sure! And maybe showing something when you get damaged as well.
Overall though this is a fun game! I'm a big fan of mazes :D I love the pixel art style a lot, these characters are cute!