The first thing that came to mind when I saw the title screen was: "Oh look, they ripped off Spaz/TLB's Megadeth font (as illustrated in the screenshot here).... which he ripped off Megadeth... oookay then"!
So what we have here? You get to roam around a dungeon and slash whatever moves to bits. It all reminds of D**blo very much (nope, I'll never mention any of Blizzard's games other than Blackthorne and maybe Lost Vikings :P) but I find this more fun.
The characters and moving parts in general are made of flat polygons that move around smoothly (at least on my netbook!) and a thrash metal-y tune is blasting in the background. I really ran out of things to say other than it's fun and easy to pick up and play. So grab it for Windows or Mac (supports multiplayer too) or play it online!