A really minor bug that I've noticed is that when you load up a paused save (at least when first starting up the game), sounds don't play until you unpause.
- Load up a paused save (loading up when first loading the game is where I've noticed it).
- Do something that would make a sound, like hitting the max belt/pipe height while pressing q/e repeatedly.
- Unpause and do it again, sounds play normally.