This is fabulous. A great concept, very fun gameplay, good controls, and cute music (although it does get repetitive pretty quickly). It's also very impressive for a game jam.
My only complaints are that I wish there were a higher likelihood for health refills to show up, and a lower likelihood for chests to turn into enemies. Plus, the chest enemies automatically getting a free hit on you when they pop up makes me not want to risk hitting them at all.
To make it more golfy, maybe the number of strokes should decrease experience points at the end of the round.
I've encountered a bug a couple of times where an inventory item's quantity fails to decrease—essentially, giving me an infinite supply of that particular item. Admittedly, it's a fun bug, heh heh.
I know this is a beta, so there are still kinks to work out, but this has a ton of potential, and I hope you develop it further : )
Thanks.