I'm only half joking. People are way too quick to label games as retro. Minecraft 1.0 was released in 2011. Retro is generally recognized as being the period 20-30 years ago.
I remember playing minecraft classic in a java applet from a post on jayisgames.com, later I saw one of my friends playing it and I was angry that they took away the ability to just instantly click and place/remove blocks. The day that they re-added creative mode was the best.