I can't explain it either, but if I go into incognito mode and try and download it throws up a blocked popup (even though all we're essentially doing it hotlinking from the itch.io site to the download on starshipinanna.com) I would imagine that most games on itch.io are small enough to be hosted internally, SI has a lot of art and music in it and is just going to grow bigger (I will admit I have not checked if the current version of the publicly available game (where we compressed the images and the audio) is withing the itch.io limit, but earlier versions certainly were not.)