An early idea for an interactive level selector made for 'Beat! This Game' (one of my team projects, check my organizations). Features first person perspective movement, basic physics, model of a room and some basic interactions.
It's very 'rough' looking because it was never touched by a 3D artist as we ended up cutting it out of the project to avoid bloat.
Unity version 2018.2.14f1
You can do whatever you like with the project.