Think the redraws took away too much character?
A quick search says this was Metal Slug Code: J, a mobile game.
Nerd powers activate... (And yes, the redraws are really quite ridiculous. But tiddies sell microtransactions, I guess.)
As a side note, I never quite understood why Fio is wearing glasses in the Metal ~~Gear~~ Slug 2 character select screen except, possibly, so the artists could have this gag where they shatter for a quick freeze-frame when you select her:
Because she definitely is not wearing glasses during gameplay, visible even when her face turns towards the camera during her reload animation:
Yes, Metal Slug has reload animations. Metal Slug has animations for everything.