If the game is not actually non-traditional relationship (NTR) and only sharing, can the swinging tag be used instead?
Yes, using the swinging tag could be a closer fit if the game is not about NTR but rather about sharing. Additionally, consider putting 'netorase' in the dev notes instead of 'netorare', and add a disclaimer in the OP that it's optional via choices and content toggle.
Is there any notice when you've seen all available content in free roam mode?
There is no current notice when you have seen all available content in free roam mode. This feature might be added in future updates if it was missed initially.
Will the influence of dreams options affect character stats or just a single occurrence?
The influence of dreams options could potentially impact character stats, but currently, it's unclear whether this will involve its own stats or if it will only affect the character after one occurrence.
Does mentioning Love & Vice in past tense mean that game is finished?
Yes, mentioning Love & Vice in past tense suggests that the game is completed. The developer played it some time ago and intended to try it once it was finished.
Will there be an Android version or online availability of the game?
The developer will look into providing an Android version or making the game available online, though this might take some time due to potential UI work required.