Well Broforce is actually a very good positive surprise indeed, i had so much fun lately playing this game. Is a great combination between, Metal Slug and Contra.
There is not story on Broforce and pretty much no motivation beyond saving the hostages (those hostages are the Bros) and kill all the bad guys you find on your way, soldiers, mecs, dogs, tanks. But that's not much of a negative at all, because the gameplay blows away any wishes for a story or deeper motives. Also Broforce is set to be on 80's/90's action movies, is something like the Expendables but on video game form.
Personally the best part of the game aside from non stop action, are the characters, you will have so many memories while playing this game, you to have an idea there are over 20 Bros to unlock and more to coming since the game is not on his final release, and you will have some very know Bros such has, Rambo, Robocop, Blade, B. A. Baracus, Neo, Machete and more, and they also have their primary weapon and a secondary.
We start the level off as a random Bro and while you progress through the level you will swapping to others Bros, plus you can keep the Bro you start off, no one forcing you to make the switch. You will unlock new Bros you saved enough Bros.
Each level is a fully destructible playground filled with explosive barrels, propane canisters, and enemies ready to kill you, beware that you die with one shoot, but you also kill very quickly, Broforce is game were you need fast reflexes. I did enjoyed the graphics on this game, very detailed, the blood, fire, flying and the explosion were the best part. All levels have destructible environments, this opens new path to finish each level quickly or to find a better strategy to defeat your enemies.
Asides from the campaign mode you have others modes that will give more post game, like COOP, level editor, Deathmatch, Run Mode this will keep you entertainment (be in mind this are all Alpha at time this is being writing).
Broforce is hard, it's chaotic, it's challenging, it's fun as hell, every time you finish a level you feel happy and want to play more, personally is a game that worth every penny!