If you are a fanatic of games where you have to think before doing any movement, then I highly recommend you to play Bos Wars, a game that requires from you a strategy to achieve victory and advance to the following levels.
At the beginning of the game, on the main menu, there is a helpful tutorial on how to make great movements within the battle field. Before starting to play, there's a game mode called "campaigns", where you can choose the level you want to play. If you do not want to play in this mode, you have to conquer one level before starting the next one. Remember that on each level, you have to develop excellent strategies to defeat your enemy.
Once in the game, you will play with some futuristic robots; you will have to create a city and collect a big army to defeat the enemy and declare victory.
Another great feature is that Bos Wars is a multi-player game, so it means you can challenge your friends or other people by using a LAN (Local Area Network) or by Internet. Besides, you can edit and improve the game sceneries, or create new ones with the scenery editor.
As regards the visual aspect, this game manages simple and nice 2D graphics, with not many details, but attractive enough to catch your attention.