Ok, it seems that there was some problem with CORS (probably, some itch.io problem they need to fix or I just messed up my browser configuration), so I just went into browser logs and downloaded file manually.
Pretty funny concept that you need to em... release your precious helium and eat flying balloons to replenish some amount of it. And love BIGBOI's face :D But gameplay is not very enjoyable - it's pretty much impossible to somehow keep the height, since releasing noble gases is expensive and it's practically impossible to replenish the amount by eating balloons. And there are no sounds as well :(