Incredible spritework. Gameplay remains solid whether you're just starting out or on run #[arbitrarily high number]. Great music that remains fresh and great even after listening to it for so long. Word of 'warning,' the game isn't massive, and you could realistically grind out 100% pretty quickly. Even so, the gameplay loop is still fun enough in itself to not be burdened by a lack of further progression. (And this isn't factored into the scoring, but there's also much to love if you happen to be a fan of LISA: the Painful and it's fanworks.)