Cool, I've been really enjoying getting back into Game Boy and Game Gear over the past year so I'm glad to see it as part of a TR theme! I'm going to aim to play some Cave Noire but I'd also like to finally finish playing Metal Walker, both for Game Boy.
One GB game I recently learned about I'm curious to try is For Frog the Bell Tolls. But since it's Japanese-only and I don't want to play it on an emulator on my PC or something to use the translation patch I'll be waiting for the Analogue Pocket to come out (and maybe for someone to make a jailbreak firmware for it if I can't patch a cart I physically have out of the box).