Thank you so much for your kind words!
As for the Pico-8, it's a very nice engine, and it's the only one I've used so far! I'd say it's a very simple but complete engine.
- Simple: In a way that you are not overwhelmed by complex menus, options, configuration.
- But complete: You can do everything in Pico-8: programming, sprites, maps, SFX and music.
As the name implies, Pico-8 is made to make 8-bit style game, so you have technical limitation in code size, screen size (128x128 pixels), spritessheet (128x128 pixels also).
All in all, I think it's a fantastic tool for prototyping and game jam. It's also a good engine for anyone wanting to take their first steps into game development. The community behind it is also quite large and very helpful and welcoming.