It's fantastic. The enemies are a bit tiny and hard to catch sometimes and the bounce attack needs some practice to get right but otherwise it all plays wonderfully.The soundtrack bops! The story, dialogue and others feel a little bloated, with the souls of other guardians giving you tips in a fairly drawn out death sequence. However you can skip those.
The only glitch I've noticed so far is the bat goo dripping on you lowering your HP without triggering a proper hit. Because of this your HP can technically go to the negative.
Otherwise it's great. Been following this project for a while on GameJolt before I moved here and it was worth the wait (I'm even late to the party, apparently).