Seriously, it's like half the time, Sintax picks a soundtrack that fits the game perfectly (see: almost everything they released with the RPG Maker soundtrack), and the other half, they pick something that's so wrong for the game that it's hilarious.
(I mean, really. A Metal Slug bootleg, and out of all the soundtracks they could have gone with, they went with Lemmings?!)
Huh, seems like the Metal Slug game is possibly even based on the same engine as Pokemon Platinum. Both games do the same fade-to-darkness thing when paused.