This is one of the early greats of S&Box here, but it kinda is falling short due to the lack of content.
The visual style is very unique for something made in Source 2/S&box, and the wave based survival is good but a bit barebone by this point(Just like Nacht's position as the first map ever in COD Zombies, which is the gameplay and map this game is based on)
This is just my personal opinion tho, with how much of the action game feel this iteration gives with the background music, I think it'd be interesting to develop it into that direction, imagine picking up jerry cans and lob it at zombies and blowing it up or like drain it out on the floor and lit them all up. Not exactly going killing floor with the slow mo and stuff but I think it'd be interesting.