Thank you! Yes, this would have been a lot more hairy had all the data not been in a single place. I had the freedom of starting from scratch, but integrating it into an existing project could mean a lot of kludges or even, in the worst case, rewriting everything, if your previous architecture was particularly incompatible (e.g. lots of global state, interconnecting references everywhere, etc.).
The balancing problem is very real. Truly, it's a very delicate process that requires a lot of time, which is in short supply during jams. Rewind was the main gimmick of my game, so I decided to spend some time to make it look and sound just right. The rewind SE is produced using a turntable plugin and some samples I had lying around. I'm glad you liked it!
If I do make a more polished update later, I'll be sure to post here!