Thanks for your comment and kind worlds.
Good point about WASD, I'll have to see if I can configure it in Pico-8. As for the corals, it's true that I'm only removing the "health" animation, but it would have been easy to change the colour too, good point!
I'm glad you checked out the devlog, I spend some time every day writing a few words. It's also nice to look back on your first day and see how your game has developed.