i like it
some of the "jump -> grab -> place beneath you -> land" things were a little too tight for my liking, but i think it only showed up in like 1 level
i really like the different colored hands, i never realized seeing a green hand would make the game feel that much more polished!
also, with the particles thing- i've found that gpu particle nodes don't show up in html5 exports, but cpu particles do show up