Nice demo ! Recorded a playthrough of all three levels but the microphone was broken so no point posting ...
level one posed a huge a-ha moment for me when i noticed the button was hidden in the light on the ceiling. really clever use of environment.
level two seems a bit broken unfortunately - gave me an error that an object couldn't be built due to some kind of lighting rendering issue and I couldn't find the button after the second press or so. kinda frustrating but eh, it's a prototype.
level three got really interesting but i couldn't make it past the room with the two buttons. i had both cubes on each their own button and ... nothing. the gate didn't open. demo syndrome i guess.
overall, neat concept, excited to see how it plays in the final vers ! only real criticism is the environments get really stale after a while, and makes exploring for the button more of a chore than a game. maybe add a few more aesthetic touches ?
thanks !!