Very entertaining and addictive, but I HAVE to mention some things.
The art is very neat and all, everything looks really nice, but you gotta put a bit more contrast between the objects. Through all the shitstorm happening killing all those monsters, you can't tell what's an enemy projectile, money or mana, or just an enemy. It's just something I felt was really holding the experience back for me. But otherwise I love it. These upgrading games hook me so quick.