Played with it just now... Looks cool, plays cool.
Not 100% I'll play again as it's pretty simple.
Also the watch UI'sa re lagging sometimes behind and so the gameplay isn't always smooth, I assume it's because of slow watch processing power
@altryne watchOS seems to throttle third party apps which does result in some lag at times. It's the system doing things behind the scenes. But it did take quite a bit of work to get it as responsive as it is now. Hopefully with future hardware releases it only gets better :)