[LVL ED] How can i create a good atmosphere?

[Traggey]

Designing a level is all about making fun gameplay and a good atmosphere.

Alot that should go into designing your levels is firstly logic, why is this barrel here? Why is this dead man on the floor, will it make sense?
Play with lighting and search around the internet for a basic course in colour knowledge, using high and low contrasted colours in the right situations is a very important thing.

So to put it simply, use logic, things need to make sense.