Here we go again, you've got a week to check out a bunch of games having their first or updated demos now in Steam Next Fest - October 2025.
Many demos will only be up for this event, but plenty will keep their demo up longer too. More demos than any one person can handle! The official trailer provided by Valve is below:

Direct Link
I've already been highlighting a number of games with demos so be sure to look at our demo tag for previous stuff. All as part of our regular programming, and no doubt more demos will get a highlight as the event goes on, depending on what I end up liking the look of.
Just to get you going for now here's a small list of stuff I personally thought were interesting in no particular order:
The event runs through until October 20th at 10 am PST / 5 pm UTC. See the full event on the Steam store.
Be sure to leave a comment and let us know what you're checking out!
https://store.steampowered.com/app/3639780/Earth_Must_Die/ [External Link]
Marvel Cosmic Invasion [External Link]
There's a article a while back, but for those who missed it, it's basically beat'em up from developers of Shredders Revenge. Character are bit different and you get to switch between two of them during the levels. All the basic hitting, grabbing and special moves are there. There's even flying characters, though I didn't get landing in my muscle memory as I always tried pushing downwards direction, but it's apparently A button.
Monsters are Coming! Rock & Road [External Link]
This one had article also a while ago. Basically it's bit similar to Ball X Pit, but without the balls. It has moving city that attacks enemies and you can build with level ups. Levels also have resources you can gather, though it's always compromise between defending the city and gathering resources. Luckily city can be enhanced with resource generation, so you don't always have to risk yourself and the city.
I guess it would be more fun, if Ball X Pit wouldn't exist. Also the music in the demo is bit repetitive.