Notes on things to do next

TODO.md

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+1. Enemy respawns
+  * every now and again, the opponents has new units that spawn
+     * indicator to show respawn is nearing
+  * is it all the missing units, or a chance for each?
+2. game end
+  * when a side is out of pieces
+3. Power ups
+  * a chance of having power ups spawn on an random unoccupied square when a unit dies
+    * +health, +attack, +speed, +jump, (pawn only) remove "attack_only", spawn a new (random?) piece, change movement type
+  * then the enemy respawns units, their new untis are stronger
+  * support for pieces with multiple hit points
+  * unit info panel
+4. Visual polish
+  * clean up tile borders
+  * multiple square tiles to add variation
+  * make the help text indicate (flash, etc.)
+5. Sound effects
+  * on hit
+  * on piece lost
+  * on piece kill
+  * on opponent victory
+  * if possible, a small bit of background music
+6. Further visual polish
+7. New units