I rather enjoy this game, as simple as it is, so here's some honest feedback:
Great start to a pretty simple idle game and it's hitting the spot. Needs a few tweaks to really push it all the way.
Needs more info on different mechanics in the game. Like what each of the staff do and the upgrade tiers that come with hitting each tier. Also what ingredients are needed for each potion would be cool to know.
Blue lapis - I have 200+ and it's the only one that doesn't seem to be used? Not sure what it's for and I can't sell any in the Orders Board. Speaking of Orders Board it needs more variation. I pretty much get the same few ones but I can never really fill them since I either auto sell the potions too quickly or I never have enough ingredients. Def needs balancing.
You mentioned a prestige system? Maybe I'm not far enough so it didn't activate but I don't see anywhere to prestige or any progress towards that prestige.
Lastly, it'd be cool if there was a way to gain more of a certain type of ingredient? Or upgrade so we can get ingredients faster? I'm not sure but it needs balancing since I can't stock up on potions I'm just constantly at zero. Maybe add a way to turn off auto sell or even close up the shop so we can stock up a bit?
Anyway, cool game and excited for your roadmap of what's coming. Hope this helps. Cheers!