That's what they say, the creators of Tinertia, they say it's a "Hardcore platformer. No jump button." Indeed it does seem to be, and what we've experienced at GDC 2015 temps us to suggest that it rocks. While we're big fans of the jump button (a classic button, indeed), we're also big fans of moving the gaming universe forward with non-traditional controls. A rocket-launcher as a primary controller in a side-scrolling game is just as good a controller as any - in fact for this sort of arena, it's better.