It's basically a platformer but you aren't the one platforming: an AI is (in this case just a dumb AI that walks back and forth and sometimes jumps).
Edit in case this is still confusing: the Jam's theme is 'collaborate with AI'. In the truest sense of that phrase, that's what you're doing in this game. You are effectively building the platforms that, essentially, a Goomba from Super Mario Bros needs to navigate to get towards the end. If you don't build the platforms, the goomba either dies or is stuck in limbo. And you cannot directly control how the goomba moves for it is a goomba and only knows how to moves back and forth (and sometimes jump because these are slightly more evolved goomba).