Maybe try letting people move with WASD it is more comfortable for me. And when you go through the first door, make it more clear that moving right does something, I thought I was stuck in the room because nothing was changing. Cool game!
It depends if the idea is copyrighted or trademarked. For example, a control scheme like WASD to move cannot be copyrighted. I know games like undertale and fnaf are fairly friendly towards fan games, but it's best to send an email and ask for permission if you are worried about something
