Colony Survival is a voxel RTS developed by a two-man team. Build your own colony in a voxel world. Command guards, farmers, miners and other colonists. Defend your colony against the monsters that attack every night.
Prices
CAGBot Analysis
CAGBot says
I think this is worth around $4. If you don't mind waiting, you might be able to pick this up for closer to $4 a year from now.