Everything was perfectly clear, except how the next room is unlocked. I optimized the start, but kept getting stuck on the next buildings not becoming available.
Thank you for review! Next buildings are unlocked on 3, 5, 7, 10 and 15 depth. Only depth, not height. I have realised that i hadn't made depth markers just after deadline
Oh that's why it wasn't unlocking for me. I was trying it on tablet and I had no way to place blocks deeper than 10 blocks after the rotation block. Everything else seems to work instead.
