Yeah, I thought that might be the case. I think variety in damage is fine, but I would still like to know my odds like spell x deals 9-11 DMG. Maybe those numbers could be adjusted depending on which enemy is selected, and you could then confirm the attack with a button when you want to execute it, but I guess that would make it more like a tactics game of sort.
I'm surprised you beat the boss while ignoring almost all the skeletons, haha.
If you didn't expect players to do it that way, then I guess it made for a good testing case. Now you know players rushing the summoner is viable strategy.