I’m not on either side here, but I do feel it’s understandable to feel misled by the developer. The issue isn’t just about whether the original 'coming soon' features were completed. The developer explicitly stated, 'Remember that if you already bought the game, you do NOT need to purchase it again. The game is bought once, and you will always have access to all future files I upload.' That clearly implies that future updates, beyond just filling in 'coming soon' gaps, would be free.
Now, the Steam version has extra features that itch.io buyers don’t get unless they pay again. That goes against the original promise. If the dev had been upfront about changing their plans, that would be one thing, but instead, they left itch.io buyers behind while giving Steam players extra content. Whether or not the itch.io version was 'complete' by their definition, the fact remains that early supporters were misled.

