alright I guess...
The game was fun, but the concept pretty much boiled down to "Figure out how to kill the reds, then play as the greens." Which would be fine, had there not also been levels where the concept is used really uniquely and cleverly. Levels 10 and 15 were really fun for this reason.
But quick unrelated question, how are you supposed to identify the entrance and exit portals in the game?
This game also fits into a rare genre where the death sound effect is the best of the lot, so that counts for something, I guess.
All in all, ok, but concept watered down to nothing pretty quickly, and eff the birds.