After spending a little time with it, I gotta say, that I was really impressed. Absolutely love the parallax scrolling, the game was much faster paced than I thought. 'Course I loved the art style, and the tone of the game had a great blend of Mega Drive and PC Engine aesthetics. (Maybe you sneaked some other stylistic touches in there, but those were the ones I picked up on) Music is very catchy, but some of it is a bit more intense than I initially imagined. It's also a little harder than I thought it was going to be, but I like it like that. Very tricky platforming in a few sections. I thought it was going to be a nice little romp of a game, but seems like it's much above that.
Only nitpick I'd have, if any, is that the hammer feels a tad weird and it's a little tricky to manage when you're moving at high speeds. Maybe if you added a slightly greater sense of impact, but now I'm just being critical. Really, really awesome stuff so far, I am quite impressed. If there's anything I could ever do to contribute, like make a promotional video for the game, let me know. (Done a few things like that in the past) I'd love to just for fun, but I've probably pestered you enough at this point, haha. Pardon my over sized comment.