Just wanted to say: thank you for making and maintaining this. I’m sorry that so many of the initial comments on this HN post are from one person complaining that their submissions didn’t get accepted. That’s the thing with the personal web: it’s personal! It’s what that person wants, which happens to be the thing that makes it great. If you don’t like it, the rest of the internet is still there.
A slight spoiler, but there's a reason why some spaces are '?' - they hint that one specific type of creature may be nearby. (Think of the one that looks like a Beholder from D&D).
For the walls - think of them as an HP sink. The game largely revolves around using your health as efficiently as possible to explore the board. Walls are useful since you can attack them 1 HP at a time to get the XP out of them (thus allowing you to always fully use your allotment before refilling your health).