Enjoyable for what it is, but not a great map. Everything is pretty cramped, blocky and full of misaligned textures.
It does try to send you on a journey of castle, mine, techy area with a small spaceship.
Link to Nightmare 100% walkthtough: https://youtu.be/kOkxOKiMT1k
Moderately interesting map. I like the messages you get when you touch doors you haven’t unlocked yet, gives you a clue at least of what you’re supposed to do.
I think the spaceship was intended to move, but might have had trouble getting it to move as they wanted it to.