I'm glad you liked my suggestions and if you ever want to brainstorm I'd love to contribute! My favorite part of game dev is the idea phase and art! :P I also encountered time issues when it game to animations and improving on gameplay concepts but I think you have a great start. I like the backpack idea, especially early on. I think it also makes sense that an alchemist would be able to make some buffs for themselves.
I can imagine the customers throwing their arms up out of frustration and essentially T-posing their way out of the shop. 😂 Feel free to DM me on Discord at any time if you want a playtest or anything! <3