When I didn't quite understand what was going on with the movement I found it a bit annoying, but after playing a bit I really warmed up to it, especially the backwards rolling. Speedrunning by quickly facing backwards to roll in the direction you're moving was surprisingly fun!
Once I figured out how you get into the bonus ghost fight next to the ConfidenceSword pickup I was struck with inspiration and I couldn't help myself.
By rolling midair from the top of the stars to the railings and then from the railings over the wall you can get out of bounds. To be clear this isn't a criticism, I love it when games break (even my own), and I probably had a bit too much fun exploring from outofbounds. Thanks to the boss arena walls being shorter than the stair railings I even made it into the chest room!
With the armour in the chest being speedy, and the note near the optional ghost fight referencing speed, was this armour intended to be linked to it in some way? It would've been really cool if you could've got the armour working in the actual game too, the extra speed with the backwards rolling felt especially fun to control, even just out of bounds with no enemies (since you can't get back in bounds from the chest room).