Summary: Fun and ridiculously impossible to survive, but it is done in under 2 hours. For 20 bucks its just not worth it. The extras are just rehashed levels, its like playing the same level over and over again.
Excerpt: "...selectable characters carried over from Metal Slug 6, some of which offer more than cosmetic differences. Ralf holds the distinct advantage of being able to sustain a hit without losing a life, whilst Fio spawns with a machine-gun rather than the standard pistol. Elsewhere, you can carry two weapons, interchangeable with the shoulder buttons, meaning you can flick between the rocket launcher (or “Rocket Lawn-Chair!” as the voice-over appears to proclaim) ...
Pros: Solid shooting; well acclimatised to the PSP
Cons: Near - total lack of ambition; flat humour; cut 'n' paste graphics and sound; short