Like it a lot. Things that need to be improved: add tutorial on how to use the app, when you switch to symbols you have to force touch the screen - it will be better if you just swipe back. I think having the time on the right top corner is useless and take space. Try to remove the time and give a bigger buttons. Remember there are people with big fingers and to press on that tiny screen will be hard. So please no time and bigger buttons.
Miguelo45 about Watch Keypad