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Though someone posted here asking about this in January, it does not seem like anybody cared enough to respond. However, this means the question remains unanswered. So, it's quite clear that the Steam version of this game has received two free DLCs as well as a number of small bug fixes. Although I can't be 100% sure, it does not appear that these updates have been applied to the GOG version of the game.

Can anyone explain why this game is not being updated here while it's still being updated on another platform? Is there any ETA or other info about the free updates? Any thoughts?
I was looking around and I am guessing this is the reason:
https://steamcommunity.com/app/1021100/discussions/0/3764480479609770763/

I’m Damon from Creative Storm Entertainment. Not to be confused with CreativeForge Games.
...
As Gambit Games is no more, I’ve been asked by CreativeForge to come in and help fix some of the bugs and make improvements to the game.
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My strategy is to be transparent and push out series of smaller, but more frequent updates instead of larger and potentially more game-breaking ones. To my knowledge, the game hasn't received a patch since June of 2022. I intend to change that. In doing so, I'm likely going to forego some of the previously-promised visual changes (ocean color and foam, for example) and focus instead on what I think are more important gameplay impediments that need fixing.

I can't promise I'll get all the bugs fixed right away, but I'll listen and do my best.