If you ever played the classic 1990s RTS games like Warcraft 1, Warcraft 2, or Command & Conquer, you'll love Meridian. There are a lot of negative reviews out there for this game, and for the life of me I can't understand why. There are some minor interface and design flaws, but nothing serious.
If you have epilepsy or are sensitive to flashing lights, you should not play Tower of Guns. I don't have epilepsy, but I find the game starts to give me a headache after 40 minutes or so. There's also no save feature, so playing through the game in small chunks is not an option. Gameplay is solid enough, though I prefer Ziggurat does it better.