It's hard to predict which enemy is healed when using Bungled Heal, even though it follows specific rules and isn't random. It would be hepful and make sense that the enemy affected by it is highlighted as well, just like with any other card that affects multiple units.
Yes please! The ties are really annoying to spot. Especially when I assume it will heal someone in the same lane but instead heals someone on a diagonal. If I remember my geometry correctly, the legs are shorter than the hypotenuse!
That would be logical, yes, but I believe the game starts counting things from one specific side of the board. With several things at a distance of, say, "one square," it might tend to choose a target in a particular cardinal direction. I'm guessing toward the bottom. The general suggestion to add a highlight, however, is a good one and has been brought up before . . . but a "suggestion" isn't a "bug" and doesn't belong in this forum.