i actually have a huge soft spot for text adventure games with mechanics that only work in text adventure games
like treating similes literally is cool
i've spoken at length about Counterfeit Monkey, a game that rules. the primary mechanic of that game is that you have a device that can remove letters from things, as long as they stay valid words. for example, near the beginning of the game you get a tube of gel that undoes the letter-removing process. but you're going to need a lot more than that, so you set the letter-remover to E and use it on TUBE to get TUB
i don't remember the name but i once played a game where a linguistic wizard died and you're basically contracted to loot their house for anything valuable before they demolish the whole place, but each room has a different language spell cast on it that dictates what you're allowed to type. like at one point you GO NORTH and suddenly everything the game tells you is written with 100% words that start with N. you quickly realize that you can only use commands that start with N, too. it won't even accept SAVE, RESTORE or QUIT. there's something that you have to take, so you NICK it, but then you realize that you walked north to get here and still have to leave. "south" doesn't begin with N. so you NAVIGATE NOT NORTH
there was another one i saw but didn't play where you're a cryptozoolinguist trying to prove the existence of letters other than the 3 in your known alphabet, by wandering the forest and hunting them down. and you're only allowed to ever type those three letters plus any that you've already found