Deep Sea Country is an astoundingly beautiful platformer with great game design and really varied original music. Its one of those water levels which doesn't actually use water (though the gravity is set to lowish, so one has more hops than one normally does). I don't know how popular LBP is in Japan but a lot of great LBP levels come out of Japan.
The Muppets Backstage Pass is a high quality platformer that makes excellent use of attact-o-gel (so one does a lot of walking on ceiling and suchlike. This is a bit on the short side but very fun. I'd be raving about the audiovisuals if I hadn't just played Deep Sea.