Very smart concept, playing this I always thought to myself is there an end and wanted to go just a bit higher to found another shadow with another man with another message.
Audio bot is trained for russian language so the vast majority of the messages is very hard to understand. Consider switching it up for more international audience.
I think this concept can be improved with more polish to the assets and overall scene (but not going too far from piece-of-art/definitely-not-a-game state it is now) and maybe a slightly more challenging mini-game to climb (like simple QTE with 2 buttons that you should press on queue) to make it the game of dedication, not only time-wise dedication of holding a button.