@ShinraPie I hadn't seen that game, no - it does look a lot like what I remember from Abe's Oddissey, nice.
All those games are free to get, yes. Here are some of the links where you'll find most of the games. Others that may be older you'd have to search for individually:
http://retrosouls.net/ http://retroworks.es/index_en.php https://rgb.yandex/ https://zx-dev-mia-remakes.proboards.com/Best.
EDIT: And apparently there's already a 2020 competition in the works here: https://yandex.ru/museum/yrgb-2020-en