Any game with any in-app purchase at all already feels unhealthy, even if its just a trial unlock.
The healthiest games are consistently ones where you pay one large amount upfront, and then are never bothered about money again, because there is nothing else to buy. The developers are so confident you will enjoy it they don't bother with free trial offers. If you really don't like it, you just return for a full refund. Feels good.
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