Finally beat all 10 levels. 9 is a lot harder than 10, I thought. I think it's a pretty damn good game. It could use a few more weapons, and a little tweeking on some levels, but pretty solid.
The boss is easy, stand under it most of the time, move to avoid his shots, when he does the double one, just stay under him, move to the left and right, and move out when he slams down, shoot him, repeat a few times, win.
A few things that would be nice if added to the game.
1) A quicker means to set your Shopkeeper skills. After a reset, clicking 200+ times gets old.
2) A way to sort your craftables by if they require special materials.
3) A way to sort your craftables by type, axe, bow, etc.