Very cool, both in concept and execution. Now I want to make something completely movement focused, too. :)
A few suggestions:
- Give a bit more leeway to the actions, allowing for distances that aren't "exactly 5 tiles". Maybe 2-5 or sth. like that
- A live preview would do wonders, so that you could always see what action you could perform right now and maybe also why you can't
- For this specific UI: It feels like switching between skills takes exactly one button press too much. Why don't you switch directly over to the new skill, instead of deactivating the current one first?