>>14082625
Millia Wars DX is exactly that. It even has 4 characters with 1 that plays exactly like a Metal Slug game. While the sprite work is good, sadly it only has 3 stages. Also it's a vore game but it's fun even if you don't give a shit about that.
>>14082661
Wild Gun actually got a remake recently. Now it has 4 characters.
>>14083607
The final stage makes up 1/3rd of the game and is fucking absurd with how much shit you have to go through.