Hehe... the entrance to the Jungle theme was very cute! And then it got down to business....
That morphing synth sound really did justice to the transition from the intro, and I LOVED that flute thing... what was that? Shakuhachi? I liked how you brought out the hand drums in a little rhythm solo... reminded me of Crash Bandicoot.

Then the synth came back in... very cool. What was that scary sound towards the end right when the music stopped? It sent chills down my spine. Very fun jungle sounds! I didn't think it would last so long, but it's a VERY nice touch!
SNOW! Hmm.... I don't like this as much... but I do. Very quirky! Playful... this game will have a nice Cute factor thanks to you. This track makes me think of a trance remix from a Midnight Racing game or something. It really speaking racing genre to me... a LOT. I didn't really imagine a snow world, though.
Windy ruins! I always liked this MOOD... this general idea, in games, and my favourite music from a lot of games was from these kind a areas - ruins. OHH... I hear a flute! Yayy! Perfect, that's always what I expect to here... and some sort of tremolo, which you included I see. Is that a lute? Vibraphone? Whoa... went into a more rock+techno mood now... very nice change, wasn't expecting that, but it works. Hehe... I like the staccato synth sound, what ever that is. Oh, there's that chilling scary sound again... *shivers nervously* I hear birdies, WOODBLOCK.... sea... more noise... I DO like how you add so much NON-music at the end of the tracks, very original in my opinion. This whole track sounded a little too much like jungle though.
Lava.... mysterious. Oh, this is
fiendish ... ! Very
evil.... oh my.... BAM, techno! Once again you surprised me. I like this... wow. You keep switching things up on me, keeping things interesting, very nice. In case you haven't picked up, I've been typing AS I listen... hmm... more lava sounds. But not as much sound as with the other tracks. Good. I hate hearing lava, it's freaky-sounding and scares me.
I hate deserts... I hope the music is at least interesting... ohh... reminds me of ... nevermind, it's perfect! I'm picturing a very rocky desert with lots of canyons and stuff, not a sandy one. Very accurate with those stringed instruments, sounds very natural. That voice was a little cliché, but I LOVED it, so I won't complain. I see you brought the techno feel a little more gradually this time. Very cool sound effects, by the way.
LoL at effects in the start of the space stage... that's just loony. Space pad sounds... very appropriate. Whoa... what is that??? Sounds like electric steel drums if my ears are not deceiving me... this is freaky. No... funky. There's a distinction... still weird and cool, though.
What's the track in the promo trailer? Yours? Not yours? <EDIT: Yours, now that I read>
Have you ever heard the music from the original Wip3out? It's by CoLD StoRage... can't remember if I showed you the stuff or not. Search for it on YouTube if you haven't, there are maybe 6 or so tracks floating around, and these stage themes you've cooked up here strongly remind me of the old Wip3out gaming I once enjoyed. Nice to see you bring this stuff back!