Very good recreation, realy like it, waiting for the ones from chapter 5, ~FLOWER MAN, FLOWER MAAAAN, With his heart in the sand~ (also can you put the "end Credits Song" from chapter 1?, please? :3)
Some Chapter 5 custom maps have already been ported by the community, for example flower man or running sky, I recommend you go to the game's gamebanana page :)
I have thought about going back and doing some more Ch1&2 maps at some point, but the next update will be Ch5 maps. But yes like cerruhh said, until then there's tons on Gamebanana :)