Not just hallways there are some levels that you fight outside and inside.
Don't base my entire game from just one demo. The demo is just to get things started.
The monsters are in the game because there has been a rift torn in the dimension of your world while stepping through a transporter when cought in an explosion.
Below is the game story it is included with the demo.
SPaceH - Heavy Weapons = Dead Bodies
70 years in the future.
Two soldiers a male and female are in a illegal weapons trade deal.
Something goes wrong and they try to get through a transporter and they get cought in a big explosion as they trasport they seem like they have not gone far when they come out they find that a rift has torn in their worlds dimension. Their trasporter has become damaged both have become seperated.
They find that there are now monsters and demons in their world.
They have to gather their weapons that they were intending to sell.
Now they must use the weapons to fight and stay alive as they look for each other.
They must try to reverse their problem that they find they are in and try to return to their normal world together.
Kenneth J. Williams