perfect little arcade game that is exactly the type of game I imagine that would fit well on a tiny console.
the firefly is clearly intentionally hard to control, but i think instead of floating around it could make small pushes with every flap of its wings. that could make the movement snappier while still making it hard to control.
heh or maybe X button (west button) makes the left wing flap, and the B button (east button) makes the right wing flap, which would make it into a sort of “flying QWOP game”
i think to make the levels more dynamic too, you could allow the player to touch the walls, but have some elements that the firefly is not allowed to touch (think spikes or lava floor). you could also have some moving parts that pushes your firefly away (without killing you)
charming game, nice job!