2. Visual polish
  * a visual / title in the left sidebar
  * multiple square tiles to add variation
  * make the help text indicate (flash, etc.)
  * visual indications when damage is done but a unit isn't killed
  * visual indication when a unit is stronger (eg. a little skull or star or something)
3. Sound effects
  * on hit, especially when the unit isn't killed
  * if possible, a small bit of background music
4. Gameplay additions:
  * powerups: change movement type, remove pawn's attack and movement restrictions
  * new units
  * choose difference board sizes
5. Further visual polish
  * animate the piece making the attack, and returning to it's spot

Bugs of note:

 * n/a