The goal of the game is to make the battle to be as big and long as possible. How do you achieve it? You'll have to assign weapons and units to both sides so they will fight but no one of them can beat the other easily.
The graphics of the game are not extremely good, but that is not important if we take into account it reminds the well-known Advanced Wars.
In short, Fail Deadly is an amusing game which is perfect if you want to play for short whiles. Easy mechanics and innovative concept, that's what it offers you.