Definitely needs some bug fixes, audio bugs out and only plays the music. Game bugs and you can't aim for headshots. Can't grab enemies like in the original.
Viewing post in Nightclub Showdown – Endless Mod comments
You need to get the head shot and grab enemies upgrades first, the idea is that every run is different because you have different abilities. Tip: you need to get the kick enemies upgrade first before the grab upgrade.
As for the sound, can you please elaborate? Which device are you using? Are you playing in the browser or did you download it, and which browser/version are you using?