The fact that this is on a self-made game engine makes this extremely impressive. I really love the graphics feel of this, the way the background moves when the camera moves makes it look really cool.
The only really glaring issue is the lack of any real content (still fun watching my soldiers get slaughtered by slimes), if there was something more to do, this would perfect. But I really love the style and the fluidity of the game, it plays like butter. Really nice. :))