not horrible
But it's not amazing either. The first few levels were fun and that's about it.
I don't like how you run out of things to buy. Most of the weapons were useless. I found myself using the shotgun for the whole game after I unlocked it. The last two just can't shoot fast enough.
Physics were annoying. Some of the jumping sequences were really difficult because your character is so difficult to control. And when you're getting shot it's near-impossible to aim so you have to run away and shoot blindly until the enemies are dead.
And the last level. It's horrible. Those yellow guys also have fully-loaded plasma cannons and they can kill you with one shot. Your hint doesn't help since the plasma cannon is like a shotgun. you can kill them with one shot but you have to be right beside them and if you get that close you're dead. I did get past them eventually though to get to the last boss. For some reason my buddy runs forward, killing himself. I don't know how to beat it if he keeps killing himself
Just an alright game.