Woah! The gimmick with the cube and the slamming is sooo creative! It took me a bit to figure out, but it has so much potential!!
The combat was a tad confusing, simply because it was pretty hard to tell what I was hitting and what was hitting me. I also couldn't quite figure out what exactly I was meant to do on the upgrade screen, if anything.
But overall, this seems really strong, and with a bit more polish and maybe a tutorial, this concept can really shine!