If you like puzzle games and marbles today is your lucky day as I came across Flux Caves, which merges them into one game.
It's early-on in development but it has a pretty great idea. It's like piecing together an oversized marble-run, with each level having various tubes and other special blocks missing that you need to slot into place.
You can see some gameplay from an early version in the below trailer:
There's a demo available on the itch.io store page, with the full version only currently costing $2. I've no doubt the price will rise as it becomes more polished and it's a pretty good deal right now.
While I love the idea, I do hope there's a lot more to it in the later levels as it was far too easy, everything was obvious since it's just sliding a couple of blocks to complete the pipe system that's there already. Once it's a bit more polished, I will likely pick up a copy and see what all the levels are like outside of the short demo.
Roll on over to itch.io to check it out. If you do try it out, do note the startup time on Linux is a little long.