Brilliant for a solo submission. I love the concept and the visual style. It is nice to have quite a serious, calm, almost sombre approach to the theme. I think it would help to have more of the events and interactions accompanied by sound (UI button highlights and presses, depositing the endorphins at the receptors, player movement, endorphins spawning off-screen etc) and the glitchy-ness of the sounds feels like a bug at times, rather than a stylistic choice. That said, the overall aesthetic was beautiful and I was well engaged by the gameplay, and managed to complete the game without getting bored. Great job!