Renegade Kid is, of course, the developer of Mutant Mudds on the 3DS eShop, as well as the Dementium games on the DS and more.
You appear to have the choice between 3 different characters, each with a different attack (sword, gun, bomb.) One of them may look a bit familiar. The goal seems to be to collect as much treasure as possible, and it has local co-op, including download play (wish there were more local multiplayer download play games!)
I don't know about you, but this looks pretty fun to me. What do you think?