Heaven or Hell RTS
In Heaven or Hell RTS you'll get to choose to play on the side of Heaven at first, but after obtaining twenty-five keys you can start playing on the side of Hell. Build your starting army, which will be limited until you start unlocking more troops with the keys you find. Once you get your troops, you have to train your army. Your first battle will serve as a sort of tutorial, so don't worry if you don't think you're ready. Once you get the hang of the turn-based battle style, you will earn some money and can start amassing a larger army and win real battles. This game has a lot going on and won't bore you for even a second. Good luck in Heaven or Hell RTS!