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You have done here an amazing work, thank you.

32x32 would be nice then I don't have to do it. :D

And do you work on some expansion packs, I really like your work and I would be really happy if I could buy some more stuff. (Maybe more different trees or more objects indoor and outdoor) ;)

Some of the RPGMAKER formatted versions use 32x32 versions of the tiles. Other than that, it's pretty fast to upscale them by 200%. Just keep "nearest neighbor" checked so the pixels don't blur.
As for expansions, you can expect more soon. :~)