This is a level for the Nintendo DS game Bangai-O Spirits. This game's oft-touted "Sound Load" function allows the DS microphone to read this sound file from your computer and thus download the level.

If you think about it, FastBots are probably the most well-developed enemies in this game, in that you have to explicitly examine them and watch their actions to an even greater extent than Longai-O's, NinjaBots or BatBots. Their invincibility while lunging automatically forces you to be careful in deploying your EX, and their machine guns preclude a frontal assault or single body-barge as soon as they stop moving.