Darn! If I didn't already own Last Federation on GOG, I'd jump on this in a heartbeat! Maybe the $1 tier? Anyone have thoughts on those games?
Well, Frozen Synapse similar to Door Kickers or XCOM without the RPG fuss. Tactical combat shooter, not really "turn based", as turns take place in the same time, if it makes any sense. You issue orders to your squad, and they execute them on the turn, in the same time with the enemies. It's pretty well done game, i had a lot of fun with it. Simple but effective. It's also great to play in multiplayer, so if you have any friends that are interested in it, you can play multiplayer with them. It's the kind of game that i enjoy because it's chilled. You can take your time preparing your turn, no hurry, you get a nice feeling when you predict enemy movement. Don't get fooled by the minimalist looks, it have a lot to offer.
Frozen Cortex it's the continuation of Frozen Synapse. Same idea, better graphics, i did not played it, so i don't know what's changed as far as game play goes.
Lux Delux - did not played it.
Shattered Planet it's pretty much an turn-based roguelike. You can try it for free if you have Android or iOS. Can be pretty fun, but i found it a little "meh". Definitely, not the worse of it's kind, but there are better ones. It makes a great coffee break game. You can play a game pretty fast, exit whenever you want, your progress will be there.
Just for Frozen Synapse, i would pay $1. It worth it. Once you get a hang of it, you can play it for hundreds of hours. If you don't feel like spending the $1, give me a PM, i'll give you Frozen Synapse and Shattered Planet keys.