Thanks for the feedback!
Are/will there be any more upgrades past the first shop?
Yes, there will be another shop and more powerful attack items in the second part of the game (which I am hopefully able to release in the next few weeks, although maybe without the final boss first).
I have one nitpick: My personal preference is never tell the player not to do something and expect them to do so anyway. Having the option "No" made me believe I might be missing something, but no, it's just a gag.
If you refer to the dialogue before the battle with The Eye, the option "No" is there so the player does not accidentally start the battle. It might be a bit confusing, true, so I guess I could make the player start licking the eye without any dialogue (or just add dialogue telling that "You decide to lick the eye").
Have the dialogue change when 1) you get all 8 orbs and 2) you defeat the Eye.
You mean dialogue with the NPCs? At the moment the dialogue is "static" and the game engine does not really support changing it easily (without hardcoding some conditions, but I try to avoid that).
I suppose a map would come in handy too.
It would be handy, but the way I programmed the game map would be pretty hard to implement at this point.