Thank for your kind words!
Well, Pico-8 is the only engine I use, so I can't really compare it to others. But I would describe it as a simple but complete game engine.
Because it's simple, it's quite easy to learn, you basically have 5 tabs and you can do everything with it, which is very cool! You are not overwhelmed with features, menus and so on. Which I think is nice when you start learning game development.
The programming language is Lua, which is quite clean and easy to learn, especially if you already know another language like Python, JS.
As the name implies, Pico-8 is for 8bit like games, so you will have some limitations when making your game.
All in all, it's good for prototype/game jam games and I'd recommend it to anyone.