It's good to see you again! I think you were the first person to play the demo when it was first released - I hope you've enjoyed all the changes made to the game since you first played it over a year ago! I'll address each point you have made:
-Thanks for noting the Healing Touch bug - I'll be sure to fix that. I added that scroll in last-minute, and that's 100% on me for not testing it properly.
-Yep, that was the intended behavior with the store vendor.
-Yes, I increased the boss' defense to provide more of a challenge. This was made after I added in Feats, racial bonuses, and additional spells - the boss got much easier over time as a result. She has 6 armor now, so doing more than 1 HP of damage requires at least 8 Attack (8-6 = 2). Spells are decently effective against the boss - I've found from other playtesters that they usually either get most of the spells or a powerful sword.
-Thanks for the feedback on the parry mechanic. I've privately had some of these same thoughts, and seeing you write them out makes me realize that the current implementation is not the best way to do it. I'll probably drop the defense requirement and make it block all projectiles for now. It also blocks sword attacks as well, and I can possibly add a Feat that enables shields to block those too, or just keep the behavior as-is for now. But the important thing is to make sure that the player understands what to expect when they parry, and the way I've got it set up doesn't accomplish that.
Thanks again for your feedback - this really helps a lot!