Voidtrain
Microtransactions in Voidtrain are summarized as...
The game offers a Supporter Upgrade. This offers some unique cosmetics and decor items. The value here is questionable, but it is primarily meant to support the development of the game.
Currently there is no planned DLC.
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Has a "deluxe" edition of the game which features (almost) nothing but in-game cosmetic items.👍
There are no additional purchases other than a "deluxe" version of the game. No microtransactions, no DLC.