This is a short, run and gun platform game. Even at three hours, it overstays its welcome. The levels are all the same - climb around some buildings, press switches to call the elevators, oops can't go that way, must brainbug an enemy to press a button or something, go grab that crate, run back to where you were, finish the level, oh wait another building except this one is in the jungle instead of on an ice mountain. There are some occasional flying dog fight missions to break it up, but by the end (well much before that) I was ready for the game to be over (make it stop). The end is certainly anticlimactic since the main boss fight isn't even the main boss.
There are some collectables - red signs you must hit. However, there is only one in a level at a time. Once you hit one, another will show up. Usually, in a place where you have already gone. Backtrack some more for the fun of it? Yeah, I don't think so.