Tensio is a game about tension. The sky is strung end to end, and the only way up is through it.
Grab one, pull it back like a slingshot, and let go, the string throws you to the next. Pull harder and you fly further. Pull too hard and it snaps under you, and there is nothing between you and everything you already climbed. Every string is a note, so the harp plays whatever climb you make. Land clean, pull again before you lose the height, and the run turns into one long line of sound going up.
This demo is the first 550 metres. It has the pull, the throw, the chain, and the first handful of strings that would rather you came back down, the ones that launch you, the ones that bounce you, and the ones that let go on purpose. The full game keeps climbing from there, into colder sky, more drifters to fly, and something that starts coming up after you.