Ninjatown
I recently bought Ninjatown for the DS, and I'm enjoying it immensely. It's an RTS, very similar in mechanics to Desktop Tower Defence but it's far more than just a re-skin. The basic idea is that wee devils (the bad guys) have invaded Ninja Town in order to steal the secret recipe for ninja cookies. You play a series of levels, each with entry points where the bad guys spawn, and exit points they'll try and reach (or an objective they'll try and attack). Your job is to stop them - let too many through and you fail the level. You stop them by placing and upgrading different types of ninja huts, each of which spawns two ninjas appropriate to the type of hut. Each type of ninja has different abilities (slow and powerful, faster and weedier, ranged attack, etc.), and will automatically attack any wee devil that comes near. Building and upgrading huts costs currency (ninja cookies), so you have to choose your combinations carefully. There doesn't appear t...