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Stasis: Bone Totem

Microtransactions in Stasis: Bone Totem are summarized as...

The game features no purchasable in-game content. The game offers a "Deluxe Edition", in the form of a "Supporters Pack" for roughly 6 USD. This pack contains a digital art book, the game's soundtrack, desktop wallpapers, and an illustrated game guide. This guide is also available for free for all players, but as a less stylized variant. The free version is closer to a traditional PDF, where as the Supporters Pack version features full graphics, illustrations, and screenshots. Ultimately the content is the same, just presented nicer.
The soundtrack can also be purchased separately from the supporters pack.

The game previously used AI generated content for some of it's in-game imagery. This has since been replaced by original artwork.

Uses, or has previously used, AI generated content within the game.
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There are no additional purchases other than a "deluxe" version of the game. No microtransactions, no DLC.