Thank you for the feedback
The idea about showing the impact from the enemy perspective is great, I will add that to the next version.
XP mechanism is already updated as you proposed - you get XP for forcing enemy to pick skulls or even more if you force him to the empty column. It will be in the next release.
In the future game, there will be more variability. This release was just to validate the core combat mechanics.
Thank you againg for the great feedback.