This is an interesting game, and I think it has potential, but it's definitely rough right now.
The biggest thing is that this game needs a tutorial. Desperately. I almost gave up on it before I read the game entry page itself and saw the controls. Controls should never be only located on a description page or in a help section--always make sure they're up front and center for the player.
There's definitely something satisfying about smacking people down with a big rock, and I appreciated the fact that you could hit more than one enemy at once. They can be a little tricky to track down though, so maybe a mini-map with dots to help indicate where to go as far as enemies are would be nice. It's definitely awkward running around trying to figure out what and where to attack because you can't see anything.
Boss fight wise, either we need a tutorial on its abilities, or it's glitched. Both times I wasn't close to the boss, but as soon as I hit it with a rock I died soon after. I don't understand the mechanic that was going on, and I'm not sure if that was intended, but two attempts was enough for me.
I also want to note that while Twitch did not flag anything, YouTube did flag "525_Tension_Music" with a copyright notice. No action was going to be taken because it was allowed usage, but I figure that's important information for you to know.
My VOD with your game bookmarked for a timestamp is here: