Thank you so much for playing, I'm so happy you worked out the puzzle at the end!
The audio system is built specifically for this game, as the engine is bespoke the sound and physics engines are too. The sound is actually bounced around the level in real time and reverb calculated based on that.
I've never heard of that game, I'll have to give it a go!
I'm hoping my latest patch fixes that issue, I'm glad the save system helped but shouldn't have happened to you in the first place so sory!