Snekburd

Here is an excerpt from Snekburd's itch.io description:

Snekburd is a Pico-8 demake of Snakebird, by Noumenon Games, with new puzzles and mechanics! Navigate the snakebirds to eat all the fruit and head through the portal to complete the levels on each island. The first island's levels should serve as a quick tutorial to new players or a refresher for returning ones.

The full game has about 70 levels in it, ranging from easy to absurdly hard, and is available for free (donations enabled with Noumenon Games' permission). You can also find the game on the Lexaloffle BBS. (Maybe give it a star while you're there!)