Excellent
I'm sure you've heard this already, but make a second one with more characters and more options. Like, scenarios with expendable minions and such.
For characters, I don't think anyone thought of this, but adding Bitey of Brackenwood would rock. ^_^
For a challenge, I'm basically taking on three teamed P-Bots and imaging that the Portal has gone out of control.
I'm currently trying to raise my survival rating. Oddly enough, my best character is Nene o.O
Great job with this game