There is nothing else out there quite like Besiege. As far as creativity and uniqueness go, this entry in the list sits at the top. Essentially Besiege is a game where you construct machines of doom from the ground up. Your goal is to conquer each land one by one using them.
As to what kind of machines you build to accomplish this, is entirely up to you and your imagination. From battering rams with circular saws on them to giant spiked catapults of demolition or a flamethrowing cannon firing machines of destruction, the possibilities are endless.
All that stands in your way is your imagination and the enemies defenses as you lay each land into ruination. Despite being in Early Access and having limited levels, it is worth playing for the fun and the experience.