It's Japanese, so I'm just guessing that's what's happening. Seems reasonable enough though.
Underworld Trip is a side-scrolling platformer. You work your way through levels just a few screens in width, avoiding a collection of creatures and obstacles that spell death with just one slip. And then you get sent back to do it all over again, in a new level, with new creatures and obstacles.
It's fun though!
Underworld Trip [Nekogames]