well i guess i finished GUN in three nights and the final sequence left a bad taste in my mouth. people yelling at you to get back onto something when it is much better to get off. long, easy, repetitive and boring final stretch up to a boss whose difficulty level was so completely out of phase with the rest of the game that at first i doubted whether the way i thought of to kill him was correct or not, causing me to try various other things before reverting back and persisting and killing him.
a very disappointing finish!
the playable area is also rather small. while playing i kept thinking that another area would open up at some later stage, but it just didn't.