Compared to most games submitted it has a lot of content and features but the swinging I found unreliable and often frustrating , it suffers from a lack of polish which is understandable. Although there is a lot I think it's just too much stuff to make a fun game in 3 days.
Building was cool, I just minecraft my way through the lava, finding your way can be a bit hard too.
There is nothing here that couldn't be fixed with a few more days of dev time.