And my second suggestion is to prevent the player from drinking a health potion if he is already full hp. I know this doesn't happen often, but I missclicked once and I thought the game would actually warn me that I am at full hp, but it just drank the potion and obviously wasted it.
Agreed on every point, especially the last. The tilde is right next to the one key, and I like to toggle the character highlighting as I play. . .I have consumed far more potions out of misclicks than the number of I have actually meant to use.