Thank you for trying it out, so glad to see others enjoying a pinball machine builder!
It seems there is a bug on how I detect when the ball is not moving anymore, and it makes it feel like there is a timer, but there shouldn't be! (only clicking on the cannon should stop a ball run early, at the users choice, but nothing else should).
I had selling existing gadgets and moving existing gadgets as planned, but simply ran out of time... (I blame it all on rust, there is just an infinite rabbit hole to improve how you implement something which can simply suck you in ^^)
But you might be on to something, having a limited lifetime for the ball could fit very well into the incremental nature of the game.
Thank you for the ideas and feedback!