From the UFO 50 website:
AUTHENTIC BUT ALSO MODERN - We carefully chose what elements to modernize. Every game shares a unique 32-color palette and we took great efforts to make them look and sound like actual 8-bit titles from the 80s. On the other hand, it was important to us that UFO 50 was fun and surprising for modern players, so we chose not to limit ourselves to the genres and design conventions of the past.
They’ve said in interviews as well that they choose to view UFO soft as a game company that was very ahead of its time
knokelmaat@beehaw.org 3 weeks ago
I think that is a bit the conceit of the collection: classic games in looks / features, but taking into account the progress that has been made in game design and mechanics. I actually prefer it this way, like an alternate timeline in which computers didn’t get more powerful and people were forced to iterate on ideas within these constraints.