Add the possibility to undo the last given point.

Maybe short press adds a point, long press removes it.

Make a paused game more visible, maybe show a notification while it is paused.

Make sure the size of the notification popup is centered and matches the text in it.

During the game it is often unclear whose turn it is to serve. Display it constantly on the watch.

Add the possibility to draw who serves first.

Possibilities to make the score display more pretty:

• Create separate Layers for the score number and align it right
• replace abbreviation with icon

Currently the pebble only uses vibration as feedback. Expand this to show a short message, like "change sides", "change service" etc.

• When a round ends the Pebble vibrates with a single short pulse instead of a double pulse
• When the game ends it vibrates with a double pulse instead of a single long pulse

Use a button to make the game pausable