A promising start! Cleaning up the control scheme to make it more consistent would go a long way, like... Why is "confirm" sometimes space and sometimes enter? If you always have 4 attacks could you have the manual selection and also have 1-4 for fast select hotkeys? Would it be better to have end turn as an onscreen button with T as a hotkey? Why does up and down sometimes move you sideways in menus? As a rough guideline, if your basic UI navigation needs tooltips beyond hotkey suggestions, it's probably not quite right yet.
I'm curious to see where you go with this, though, and I'll try to remember to loop back in a while. :)