While there's not much content yet, the game's pretty damn good. The combat is a little clunky because of how enemies relentlessly advance even while you hit them, but you could just give the non-sledgehammer weapons some more knockback to fix that. Aside from that I just think enemies shouldn't be able to grab/attack the player while they're getting up. Those are all the negatives I got, not many at all.
Now for the positives. High knockback weapons are good to use and fit the game much better, the art is pretty nice to look at and just needs some fine tuning, the animations are very smooth and full of character and the enemies feel balanced and not frustrating aside from the one issue I mentioned earlier. I can totally see the great game framework you've got to work with and I see its potential to be even better, so adding more to that can only make everything much better.