First of all, thank you so much for the continued support for Serenitrove. Knowing someone's enjoying the game really makes my day.
Let's take a look at the bugs you mentioned:
1. I was able to replicate this one on my end too. It seems to occur when switching from Shuffle to Loop and back again, then selecting a track manually. I'll dig into what's causing it and aim to roll out a fix in the next bug patch.
2. I haven't been able to reproduce this issue yet, so I'll need to investigate a bit more to figure out what's triggering it.
3. Equipping boots underground does have a stamina cost of -5, just like with tools and accessories. Also, bonus stamina from gear is added as empty stamina (rather than filled), to prevent players from swapping boots mid-run for a stamina refill. However, if you equip boots on the surface, there's no stamina cost and the bonus stamina should be filled. If you ran into this on the surface, that might be a bug.
4. I've actually streamlined how the furnace unlocks. It now unlocks at the same time as the anvil, and Clay has been removed entirely, since its only use was for unlocking the furnace, and that process was a bit confusing for some players.
5. You're totally right. The transparent boot equip slot shouldn't be visible in vegan mode. That'll be fixed in the next update.
Also, I really appreciate the kind words about vegan/ironman mode! It's definitely designed as a bit of a hardmode. Removing the torch makes things much more challenging. And thanks to your report, I just realized that the 250 light radius requirement is making Caelo unobtainable in vegan mode. I'll be working on a fix for that too.
Thanks again for the detailed bug reports and thoughtful feedback. It really helps make the game better. I'm glad to have you along for the ride :)