Yeah there is something weird going on with Replacer. Must time some timing issue as it doesn't always do that. Yeah there are quite a few combos that would go infinite and that is exactly why the tilt mechanic exists. This one doesn't net you that much score though.
The pars increasing mega exponentially is very much intended. It's a score game after all and it needs to end at some point. I tried to balance it so that it would be very very difficult after 20 and impossible when getting near 30. But it has been proven to me that even 60 is achievable.
Thanks for playing! ❤️