Hi !
Just saw it once so i maybe missed some points. Here is my little review just forgive me if i do some mistakes

:
First :
THIS VIDEO IS JUST A-MA-ZING. I knew that you would do an update late August but a so nice one OMG
Rayfist said:

u can say it...
Rayfist said:
I just finished it, and I gotta say, this is your best work ever.
YES AGAIN...
Second :
General Review of the maps and each map one by one :
* General :
- Rayman's motion is so great...he moves well through all the map. I don't care if he can't do helico today

...
- Environment reaction seems to be awesome : When Rayman does a great jump and lands, we can hear the print of his feet on the ground with the gravity of sound. Each step he does we can hear it...
- Mystic ambiance is preserved. Each music i heard is like that. I really worried about this fact in ROTD Ray because i missed it a lot in Rayman 3 )':. Good Job !
- U did so nice work about the background in all the maps ! Even if sometimes it's not quite perfect (i'm thinking about the mountains in The Cayon of the Lost), it makes the difference for the ambiance of the map u are walking in...
* Dream Forest :
- Ambiance ++.
- Special attention for the sea and the rivers which are well animated.
* Memory realm :
- The falling leafs...i loved them <3.
- Fireflies move well on the screen ++.
- Is that Rayman replay on the stone will be real ? It looked both funny and mysterious

loved it...
- The calm path at 9:30 so cool

...
* Gemstone Ruins :
- Caves +. (HELP ME THERE IS A GHOST THERE ! AAAAAAH....).
- It reminds me The Sancturay of Stone and Fire at night (just a bit ^^).
- Water drops at 11:10 <3...
* Music Mountain :
- Stirring music (dunno if this is the good word for that :/ my lack of vocabulary i hate it...).
- u kept some rythm from the orginal music good

...and the new one is awesome too (hadn't listened yet all your musics).
* The Ice Volcano :
- Some space music ? I felt like i was in space at the beginning of this part...
- Scary place.
- Lightning sound at 14:27 : how did you get it ? Sounds nice !
- The caves' light at 15:20 is adapted to the ambiance of the Ice Volcano.
* Temporal Palace :
- It seems to be a strange place. You did well.
- i thought that the gears at 16:08 and after are really well done (i'm currently studying in an engineering school of mechanics so gears are always on my path ^^). Walking on them seems to be fine (can you be crashed into the wall by them XD ?).
* Canyon of the lost :
- The ambiance gives a good depiction of the place (reverso is a nasty translator >:< dunno if i explained my thoughts welll here...).
- Do not miss your jumps

!
* Picture City :
- Wonderful design.
- THE PENCILS ARE BACK !
- Is it ink raining ? sounds well if it is !
- When u are in this world, when u are walking will u see all in black and white ? it seems really appropriated to me.
Now it's time for Rayman's motion and different movements after 20:00 :
He has a good walk everything is fine in it. The jump seems to be like it was in the 2 but nvm it was quite good

. When he's falling after a jump, particular attention about the hair's move which is just wonderful (especially the orientation of them...). He has a good landing too after it (we can see the real effect of gravity even on Rayman : for me it was like he had kneels XD...). His run is quite coherent. I love how u made his scarf move during it <3.
This eyelids WTH ! Their moves are just so great ! U made at least 6 or 7 expressions only with the eyelids. So collision problems with eyes i saw nothing OO nice job !
When Rayman is climbing, u made a wonderful work on the moves of his hands. Their moves are well appropriated to the situation.
I especially love the way he does his "COME ON U BAD GUYS !" at 25:30.
The move sequence of the charging/throwing/backing fist is almost perfect for me. Does Rayman put his left hand on the ground at the middle of the movement to allow himself not to fall ? i saw it in that ways and i found it really cool. The fist's way is pretty elastic and it's cool too...
Last but not least : Dark Rayman.
AAAAAAH HE'S HERE ! HE'S REAL, HE LOOKS SO BAD AND SO PERFECT AS THE BAD GUY ! Special mention for the hair and the suit with the red scar...
To finish : I DON'T CARE ! His voice sounds great.
Pfiou ! I'm done ! Hope this will help and be a start for other reviews of this so awesome update ! Hang on RayFan u did a great job so far ! Good luck !
EDIT : changed some punctuation to make it more understanding...