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Islands of Insight is free to keep forever until tomorrow, June 27th
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Absolutely grabbed it.
I figure they're trying to boost player numbers before the summer sale (later this week).
Game had a very rough launch, and there's some questionable decisions the development team ran with (always online), but hopefully it'll get an offline mode in the future.
Offline mode should be released 9th of July, if I remember the post on steam correctly.