This was such a charming and engaging little puzzle game! Anything made in Pico-8 already wins over my heart, but it won over my mind with its wonderful puzzle mechanics and layouts. I'll admit certain levels did stump me before realising the new mechanic it was trying to teach me (it took me too long to notice I could push objects on level 3...), but the balance between difficulty, novelty, and engagement is treaded with sophistication and without fault. There honestly feels like no need for a proper tutorial as you've clearly designed it to gradually introduce mechanics in obvious ways then twist them in ways the player might nor expect.