I can't give you numbers but it doesn't download a huge amount from the internet. Maybe a few megabytes every time you run it.
That said, I finally got to the centre of the galaxy and can thus officially say that it's not worth buying. It's only fun as a game of designing creatures, buildings and crafts. What you actually do with them is boring as batshit.
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Spending as long as I do here, it's easy to forget that Oddworld has actual fans.
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