Use mouse to look around and LMB to interact, click everything. Press m for map. Hints down below https://www.base64decode.org/ if you can't figure out the first code then the code is 1002 One of the doors sends you back a level and you have to keep opening it and it will randomly let you pass through.
Almost all the sounds used are not mine. If you don't know how to progress, you can scroll down in the instructions for help. Game is incomplete and ends at stage 7