Thanks for your comment! It's a wonder what Unity's URP along with 2D lights and a 'shadowcaster' on the player can do to those simple (but beautiful) 32x32 Dungeon Crawl Stone Soup tiles.
Re: the dying sound - I pushed a quick fix to the game now to fix that (silent Prefab variant version of the Coin Sprayer and Small and Large Coins) as I don't want to damage anyone's ears. My mixer seems to duck the audio automatically, but I guess everyone's audio drivers / devices are different.
PS. prefab variants are one of the most useful things I've learned about on the Gamedev.tv Unity course. Great little things.