SteamWorld Tower Defense

SteamWorld Tower Defense is a tower defense video game by Swedish video game developer Image & Form. It was released digitally on Nintendo DSi in North America, Europe and Australia on July 5, 2010. It is the first game released in the "SteamWorld" series.
Gameplay.
In "SteamWorld Tower Defense" the player controls an army of steam-powered robots in a tower defense-style gameplay. The aim of the game is to take down wandering troops of human invaders in their attempt to steal gold from the robots' mining facilities. To clear a mission, the player must take down waves of human soldiers by building and strategically placing out attack robots with a range of abilities and weapons. It's possible to play the game on several difficulty levels.
Reception.
"SteamWorld Tower Defense" on Nintendo DSi has received favorable reviews from critics, with a current score of 71/100 on Metacritic.
Development.
On their YouTube channel, Image & Form revealed that "SteamWorld Tower Defense" is the hardest game the studio has created. Apparently, the game's lead developer is the only of Image & Form employees to finish the game.
The game is set before the events depicted in "SteamWorld Dig" and "SteamWorld Heist".