Very delightful and full of character, squeezed 2 good hours out of me, no minute of which I regret.
A lot of my appreciation comes from Sylvie's ability to work in constraints, square ratio with 4 inputs, it serves as an amazing lesson in restraint.
Despite my enjoyment, I think the weakest part (and the only majorly critiquable aspect) is the bosses, which generally suffer from telegraphing and speed issues.
I'd recommend you to play this if you have a spare 2 hours, since it is quite fun.