The Release of Heaven is just a shooter: go in, push buttons and that was it. There are three buttons in the control room (the control room is the room with the shootable windows and is reachable from start when you just go straight). Each button invokes one step of destroying the big crystal on the surface of the flying rock and has to be acknowledged by the red crystal control button near the crystal before the next step can be invoked. (easy in multiplayer: one player in the control room and one at the red button). The exit is the hole which is corked by the crystal. The way from the control room to the crystal: go back to start but turn right once when you get the possibility. Once you're on the upper floor of the control room turn left and take the lift up to the surface.
Tips:When you press the red crystal control button the first time, a creature factory starts spawning skaarjs which patrol to the control room. So the best is first going up and clearing the surface, then invoking and ackowledging the first step and only then using the jumpboots near the fan to get up quickly again to ackowledge the second and third step.
When you press the red crystal control button the third time, the crystal will explode. So stay behind the protection wall.
All monsters will die when the crystal gets broken.
Secrets:Some superhealthes on surface behind the outline fence (but humans can't get back from there, hehe).
The Zeppelin invites to a sightseeing flight when the crystal is broken.
