I like the fact that crawling is part of the play mechanics! I'm glad it is available at all times, not simply when you are near a small tunnel.
I will never understand the logic of making it "only available sometimes"... it's much less work to do it the way JB does it!
I hear you.
I think the only reason some games limit "special moves" to specific locations is because they fear that sloppy implementation/stage design may create weird, unintended situations. For example: (1) crawling off a cliff, but not falling down, because technically 1 pixel of a Jungle Bros. is on a ledge, (2) Getting stuck in a nook or cranny (bonus if you can do this whilst falling!), (3) crawling may be exploited to breeze through segments of game intended to be challenging (enemy attack/AI are designed without crawling in mind, savvy players may use this to their advantage, but suck out some of the fun in the process.
I really love everything. I wish there were "useless" powerups in Jungle Bros. (e.g. power-ups that change JB's pants/jackets color). Last color picked up is the one worn by our hero. No need to make it any more elaborate than that. Oh, and short shorts should be available as part of his wardrobe change as well.
I'm serious.
DISCLAIMER: I know you guys are well past the stage where you'd implement any of the things I mention, but I can dream. And dream I shall.
....I see "short 'n curlys" 
You aren't the only one, clearly. I must be juvenile, because I became obsessed with the clouds. Or, I am experiencing cloud-envy.
Either way, I need more coffee and some fresh air!
