Very beautiful artwork!
The characters are cute, the palette colors works good with your game and the level design os the stages are awsome.
I think the double jump has a little problem. In the "Deserted Desert", in the platforms, the second jump sometimes it work ssometimes it don't works. Maybe it's because i'm pressing the walking keys at the same time. It didn't bother me much because in the second third time, i was prepared.
Anyway, i see you put a lot o effort here (seriously, you put a lot of sprites and scenarios and it's so fkn awsome XD) and you realy make a master piece! I enjoy too much your game.
Congrats, friend! I have a lot of fun with your game! S2