Both of these suggestions rock! Definitely some of the best games in the genre period.

I'm currently replaying SoTN for the 6th time right now. I can't recommended it enough.

I will saying playing it on a handheld like the Rg35xx or the RP3+ is made drastically better by applying the Qhack mod. It fixes the resolution scaling for 4:3 during the main gameplay giving you substantially more screen size.

It unfortunately does open a passage earlier than intended, but I can't go back to the original on my pocket. It's easy enough to ignore until you'd normally open it.