Really cute visuals and a really cool central mechanic, I would love to see this as a full game with more depth, and perhaps files that had special functions. Like super buoyant tiles that helped stabilize your island as well as negative tiles you would need to quickly cut off.
You could definitely expand the game to have a duality going on of building on your tiles to create different buildings and outposts while defending your floating island and selectively choosing new tiles as they pass. Perhaps even enemy tiles with invaders that attack your people! So many possibilities!
With the cute design and so much you could expand on, I really hope to see more! Great job!