This is apparently a remix, by Black Dragon, and a quite good-looking one. It certainly adds to the variety of maps available, as among the rocky crags here you will only find one weapon to pick up - the whomper! There are plenty of it, though of course as they each only hold one shot, the action will not be quite as insane as you may expect...
So, a nice idea, and cleverly executed. I am not sure how long I would want to play a game here, but, with a few friends, I think we would be having a high degree of fun. Maybe, if we all agreed, we might go into "cheat" mode, and become invulnerable, so that the balls of whomp just threw us about? There are certainly possibilities!
One drawback here is that the "living area" is small. It is possible, with a megajump, to get onto the outside wall, with a view to exploring the interesting terrain outside - but the jump will kill you, which seems a bit harsh. A new version, with the more usual Whomper spelling, has been promised, so I hope that may give us a bit more room to play...