6.I thought that I a game dominated by VG characters should have a VG themed level,
7.many of those tunnels are too narrow for many of the sprites to fit through.
8.Thats grapically inconsiternt with a theme (vagueley) followed by the characters.
9.this is supposed to remind you of picture wars, but with some Brikwarsy twists.
As for the Metal slug sprites, I've nevery played them, so i woudn't know It was wrong