Greetings! Glad to hear you enjoyed it!
With the theme of Rotation, I couldn't resist :D
A timer was the very next thing I would have implemented, but alas, experimental physics and bug-fixes are a time-consuming ordeal.
In the meantime, the game is over once you have no more targets left to break, and all your left with is your final scores and the bragging rights that come with them.
On the topic of competitive play, I couldn't agree more, and hope to one day have a fully functional leaderboard. For now, your highest score should persist between sessions, so you can still challenge your friends to compete for the title of Gunslinger Supreme!
Thanks for playing, and I appreciate the feedback! :D