Honestly...
I hate it, people give it 10's because it's a staple on NG, but honestly, it just as simple and entertaining as the hundreds of other games on this site.
I think the dying in one hit thing is my first turn off. I know that metal slug did it, but the enemies were also at a good AI level and shot just enough to make it sort of challenging. This game, as soon as i land and shoot, i get shot.
Not one of my favorites, but ill give it a five for being an original.