It's an accessibility version, but also just a fun way to play it. It's much easier like this on a touch-screen device. Luca kindly gave me permission to mirror it here: https://oneswitch.org.uk/art.php?id=112 - where you can see Colin McDonnell (a switch user) playing one-button / one-switch Dragon's Lair.
Luca's made a brilliant job of this. Wish there were more this good.