Oh, I always have those sort problems with my levels.
Alright, let's first start off with why Devan is destroying the forest.
Is he harvesting lumber for some super wood robot? Is the forest the ideal place for his new industrial plant, and must be removed?
Once we get Devan's motivation we may get some footing on where the player will be sent next in the level. Let's say Devan was building an industrial plant. Perhaps part of the level would be the player trying to destroy the construction site's base so the building cannot be built.
I would also highly reccomend a puzzle utilizing the electroblasters. They're fairly useless otherwise.