We considered making it more obvious, but I feel like part of the fun is searching for things and suddenly finding something new you can control :) I was a little worried that the ground ones might be difficult, which is why the second level forces you to figure out that you can manipulate terrain sometimes, and extendable parts of the floor are always visually disconnected from the rest. Guess it could still be a bit more visually distinct though! Thanks for the feedback, I liked your game by the way :)