(Anyone complaining that it's still not loading: Check your adblock. It might be preventing the game from loading. Worked for me)
It's basically pretty good, but there are some things that bother me.
First of all, it's really hard to manage with those robots that shoot lasers and those plants that throw something, because they come at the end and I'm really busy with killing those that are breaking the door. Meaning that I can't go hit or shoot those range monsters behind them. I would do something about that.
Also, Joe isn't the kind of guy who would just move up and down. He would have already ran there into the enemy troops and slaughtered them all.