This is another level I played yesterday, willfully taking some time off from work that I really couldn't afford to take off... ;-)
I really enjoyed this level. Great atmosphere, pleasantly sunny despite being underwater. Great ambiance, too. I enjoyed the look of the different areas, for the most part - in some cases, immensely (the green area, the deep chasm with the black and white colour scheme, the 'houses' under the sea where the level starts out.) In a few cases I think the tilesets used clashed a bit with each other, or with the rest of the level (the very light blue one with the very dominant pattern in some of the deeper parts; the black-and-purple striped one), and some of the area transitions could have been handled better (undersea houses to black-and-purple area is particularly abrupt - and also, as I enjoyed the houses area so much, ideally I would have liked to see that area continue for a bit, I think! :-)) Still, overall this is a very good level, and due to the extremely relaxing atmosphere definitely one I'll keep for replaying.