Hi Husaria,
1. I understand your concerns about the sprites you would wish the collection has but that hasn't been added yet. Please understand that the Minifantasy collection is huge and it is being used by many different devs to make prototypes and games. Everyone needs different sprites to cover different game mechanics and ideas.
I always try to include suggestions from my supporters, I take note of every single idea. I have a huge backlog of suggestions, planned new packs and other additions that I tackle in priority order every week. Unfortunately, my time is limited xD
An 8x8 icon collection is planned but it hasn't a release date yet.
2. Upcoming asset packs are decided by my Patreon Community every month through polls. The direction that the Minifantasy Collection takes depends on them.
Thanks for all your suggestions and ideas, I'm really happy you like Minifantasy!