Thanks for the feedback. It's much appreciated. I should stress that I'm not an artist and all of these were assets that I found online, so I can't take credit for that. There's "premium" versions of these assets that I've since bought to both support the artist and add more stuff to the game in the future.
I love the idea of having the boss chase you around, I'll definitely have a go at that. I also want to go back and tweak the character movement to make it a bit snappier.
I had played around with destruction a bit, but couldn't get it to work properly. I had to disable physics after a little while for these items because otherwise there'd be weird (albeit sometimes hilarious) glitches. Definitely something worth going back and tweak at some point, though.