Metal Slug Tactics review: the crunchy arcade run 'n' gun pauses to have a tactical think

I am a very casual enjoyer of Metal Slug games. I've never actually paid for one of these side-scrolling shoot 'em ups, except for all the countless coins I happily pumped into arcade machines as a child. To this day, if I see a rare glittering cabinet running one of these crunchy shmups, I will go ham for twenty or thirty minutes, and walk away satisfied that I have seen a lot of very good pixels. These games, I am convinced, were never really designed to be completed, but to be played exactly like this...