As far as I understood it's a matter of filesize or something. Playing over android is explained at the end of the description:
From version 0.13.2 onwards we will no longer be releasing a dedicated android version. Please use the windows version on Joiplay. Instructions on how to do this are provided here.
I have looked into this and decided against it. It would be complicated both for me and for the user. There are too many things that could go wrong during installation and I don't have the resources to provide technical support to thousands of people. Joiplay is the only real option at the moment. Anything else would slow down development to the point it's not worth it. Once the game is eventually finished I'll make an android version this way.
