I've always been a fan of this kind of idea. You done a good job of making such a simple mechanic feel like more, it's a rewarding experience. I do feel a bit OP in the end though! :P
It's one of those games that I want to make myself! It's like a boiled-down bask-to-basics Dynasty Warriors kinda thing. That mindless hack and slash. This with a story, fixed maps and that sort of progression would be dope.
Yeah, awesome work!