It’s almost a tradition by this point, to take some preexisting game and give it the roguelike treatment. We’ve seen MetroidRL, CastlevaniaRL, MegamanRL, ZeldaRL and others. Those in this list were all made by Slashie, a prolific developer in this sphere.
Well, his most recent experiment in this mode is SpelunkyRL, taking concepts that Spelunkly itself borrowed from roguelikes and borrowing them right back. What the game gains is a strong emphasis on situations and using what’s at hand. You only have five health points, and they don’t heal naturally. Most enemies move only every other turn, but if you attack them they get a counter-attack. You have a gun with six bullets that does high damage, but it’s a good idea to save your shots for when they might be needed.
You can pick up pots, corpses and even stunned enemies, which don’t go into your inventory, but remain in hand and can be thrown at attackers. Instead of food, there’s a “DooM” counter to keep you moving. There are also altars for sacrificing enemies to Kali, which work in a NetHack/ADOM kind of style. And there’s even some atmospheric music and sound effects so you don’t have to smack bats and snakes in silence.
It is an interesting thing to play around with, and on subsequent games you can start with alternate character classes Rogue (extra health and bow) or Tourist (bad at fighting but has a camera and 2000-gold line of credit). It will be a reasonably entertaining use of your time, I’d say.