Steampunk Tower 2 is a good alternative take on the tower defense genre that mixes various gameplay styles in a successful way. It will surprise you with simple but also deep mechanics and a pleasant style.
Cefore is, for now, a very Alpha stage title, but it already impressed us with fresh and stimulating mechanics, promising a straightforward but at the same time complex level of gameplay in the future. We have our eyes on this.
Band Of Defenders is a promising tower defense with potential that still lacks in balance and progression mechanics, falling short in several aspects.