Thanks for the comments/suggestions!
I was worried that the controls would be a bit annoying to people who aren't used to vim, but I'm not really sure of a way around that since it's kinda part of the core conceit.
Scrolls are used using @[register], same as eating a corpse. I'll add that to :help scroll, thanks for pointing it out!
Making marks visible is also a great idea.
Once you have hlsearch on, you can /landmine to find landmines. Or you could try yanking every square before moving to it, thus picking up any landmines in your path. But even without doing that, you get a warning when you first step on a landmine, and all you need to do is move out of the blast radius in a single move (so e.g. 5l would work), which I think every starting class is capable of by default. That being said, it is definitely a bit too easy to set of a landmine if you're not being careful, and I'm still trying to figure out what to do about that. (Also, if you have a magnet equipped then you automatically set off landmines when landing on them, but that's an unintended consequence of the magnet functionality that I didn't have time to deal with before the deadline.)
Thanks again!