I and my friend tried to play this map but we can't even get to the menu screen. It just shows a black screen and the game isn't responding anymore

Stamin-up works like that in the map. Some of the perks work differently on this map: Stamin-up goes on and off randomly, Mule Kick is available once you activate the teleporters and Electric Cherry is received when completing a small easter egg.

Oh okay mb then ^^

I'm gonna make a quick written review of this map

Level design : The map is beautiful and contains a lot of detail inside and outside the map. Contains a good fog, fx's are used well and the snow itself is very well designed. This is a 9/10 for me.
Features/Gameplay : A classic Der Riese style using almost every features of Der Riese (I was hopping the map having headspeakers for power/linking teleporters) Added 3 more perks (Hadn't done the EE, sorry ) The setup is made quickly and there aren't much things to do. But for respecting a classic fun Der Riese style, I'll give a 7/10
Execution : When I saw the pictures and I started downloading, I was affraid that my PC will lag and was hoping caulking/portaling were made well. And I was right : not a single lag while playing. Excellent job for this. However, Stamin'up is glitchy as fuck : It was on when the power were off. And it was off when the power were turned on (And sometimes, Stamin'up would turn on randomly. Happened when played with 2 players) Otherwise, it is a 8/10

Overall, this is a 8/10. Beautiful Der Riese map which is a succesful upgraded Der Riese. Good work on this one !