This is a good start. But the there are too many issues to make this a paid game still in my opinion. The bosses are trivial as they get stuck in trees on the map so they can't do anything. The weapons are not noticeably different at all. I tried doing a whole run with just the rock and it was just as easy as when buying weapons. 

Range weapons gives melee weapons no purpose to exist.

Another issue is that enemies don't scale and can never catch up with you while you are sprinting. Keep working on this and it might get good at some point, but it's not quite there yet :)