I had a similar problem guys although opening the doors was pretty easy, press R then move mouse left but getting in to the door was nigh on impossible.
I was given the option E or R and with option E then I got "Alt - Drop"
But you've started a game based on the Fk'n Cube. Most awesome
regards
wobblyfootgamer
My spec btw
AMD 6300
16 gigs of ram (Suites you Sir)
2 x SSD
1 x 3 tb drive
Windows 10 64bit
gtx 1050 TI graphics card