Monster castle defense is a fun tower defence game. It has four maps, each of them are different castles. When you finish the first castle, you open up the ability to play at the second one. When you finish the second one you move on, until you open all four. You can play on easy of regular, so really there is eight different levels.

The game makers description:

Protect your queen from the evil human army that wants to destroy her. Summon monsters, upgrade , evolve and create a powerfull(sic) army.

Instructions:

Use mouse to play. -—- Select monters to: -—- Ugrade attack: Sword button Evolve: Arrow button Sell: Money button OR: keyboard shortcuts: q,w,e,r,a,s,d,f—monsters z,x,c,v—spells t—-rise attack g—–upgrade b—–sell