Calm Before the storm

A unique game idea concept This is a Tower Defense game with multiple units. Setting: There is a massive storm incoming. The sky is cloudy and thunder can be heard. The crimson demons are 

Rapidly approaching the castle. As soon as the sky turns red, crimson demons will descend to teh ground 

And you will have to fight them off using whatever troops you have. You have a certain amount of time before

They strike , so you better be ready to face them.

Characters Troops: Archer: Fires a a single arrow at the demon every second. Can be upgraded to fire faster.

Crossbow: A more advanced version of the archer. Can deal more damage twice as much to be precise but costs twitch as much as an archer. Can be upgraded to deal more damage and fire faster. Turrent: Rapid fire turrent that rapidly fires arrows Rifleman:  Unit That can simply oneshot any enemy with a rifle. Cannon: Explosive shell that annialtes every emeny in a radius.  in the row. Landmines: Explodes and fires arrows in all directions when stepped on. Boiling hot oil shooter: Slows down enemies and hurts them by shooting boiling hot oil from a turrent. Enemies: Crimson demons