The version 3 of the english adventure game Tristam Island by Hugo Labrande is available for 3,99 dollars (25% cheaper starting 20th december). The demo version is limited to the first chapter of the game for a game time estimated to 1 to 1h30 hour which will let you discover the game before buying it if you are interested at this low price.
This adventure game is using the framework used by Infocom's games, the Z-Machine, which was reversed-engineered and documented in the 90s and implemented on dozens of platforms. This is how "Tristam Island" is able to be released on 36 computers (8, 16, 32 and 64 bits), including the Amstrad CPC and PCW. The game uses a library optimized for speed and size, PunyInform by Fredrik Rasmberg and Johan Berntsson.
If you buy either the english of french version, Itch.IO cannot permit to get the other version freely. But with the low price you can buy both : a traduction needs a lot of work and all work merits some payment. But Hugo Labrande will give you a key of the version you didnt buy if you ask him.