This is awesome, and the whole Rubik’s cube idea is just incredible.
Everybody else is talking about that (deservedly so), but I also love the Danger Clock! That’s a great mechanic, and a clever way of ratcheting up the tension. It’s almost something I’d want to give the players, so they can see that new scary things have been unlocked, but that’d spoil the surprise. I do think it might be worth scaling up the dice more quickly so there’s less overlap between the possible encounters for different phases, but that’s tough to squeeze in given the space constraints.
Other than that, this is a very fun adventure and a really cool idea. Any table of players would really like the cube mechanic, and I’d probably just give them the cube and let them play around with it (maybe with removable “fog of war” tiles for unexplored squares?).
You should be proud of this, it’s awesome.