you just have to give it a time

at first it starts really slow
and youre gonna think its boring but once you start getting the other unit
the game starts to open up and gets really exciting.
i know cuz thats how i felt when i first downloaded this game
so give it a try and you will enjoy this game
btw you dont need to buy a medal because as you progress you earn a medal for completing a set of stages.

Riceyspicy about METAL SLUG DEFENSE, v1.3.0