Dominik from 70:30 is currently working on a new tower defense / RTS game for Steam called Phalanx of Resistance.
It will be available on Steam and there will be a light version for mobile devices too. Build your own base, set up your defense towers, level up weapons and protect the base with your life! Research upgrades and weapons of mass destruction to defeat the enemies in 5 exciting campaigns with different planets. A multiplayer co-operative mode is planned too.
Check out these preview screenshots!