Great submission
Great submission indeed. You made a real good job with the Metal Slug sprites and I am sure it is not only me who thinks this way.
The intro music made me feel quite relaxed though. The loading screen with that song made me not want to play the "play" button, I really liked XD
You kinda need to improve the sounds though, it was only the background ones and the sprites. Well, that did not look bad actually... hmm... well, it is up to you =D
Anyway, I'm going to watch it again, I am sure I missed one or two things...