Was just about to make a community here but guess I don't have to lol.

Pico 8 is basically a "fantasy console", definition is tough to define but its basically its own micro console but not tied to any physical hardware, tho people have made those with raspberry pi's

As for recommendations, this video by Superclass gives good examples Here

But a few I can give is

• Celeste Classic
• Birds with Guns
• Dank Tomb
• Poom, a Doom demake
• the Cat Doctor, a small puzzle game (note that this is a commercial game so gotta pay for that)
• Alfonzo's Bowling challenge

Among many others. All the free ones are browsable in the BBS as well as using Splore in the program itself.