I have a few cents to put in!

(don't worry; I turned noclip off after taking this

)
1) There are some overworld chests that won't open here:

2) The encounter rate is a little high in general. I'm getting encounters about every 5 to 15 steps, with the distribution closer to 5 than 15.
3) The dreadnaught confuses me in the balance of scripted and random encounters. The frequency of scripted encounters, in my opinion, would dictate there be fewer, if any, random encounters. I once went from a scripted encounter, took a single step, and ran in to a random one.
4) The item limit. I use a few potions, and can only buy up to a certain number back so I can have a total number of items combined. I know it's nitpickey, but it feels arbitrary. I don't know how your item data is stored, though, so it might be necessary.
5) I get weird encounter text when I step on this skull. Debug thing, maybe?

That's all I had time to do this weekend (due to a few unforseen events). I'll get more to you soon.