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Also if you want some interesting soundscapes, I can recommend exploring mynoise.net. They have a huge variety of natural and artificial soundscapes, including a bunch of musical ones that are all tuned to be compatible with one another, so you can mix & match them. They also have a phone app, but you can only use one sound at a time with it. Also not everything is available if you don’t make a donation. I gave them 5 bucks a couple of years ago and it’s one of the best 5 bucks I’ve ever spent. It wasn’t hard to then spend a few more dollars on the app.
I use them for focus when I’m working, but lately I’ve also used them for sleeping. It works really well for me.
A Dance of Fire and Ice is an incredible rhythm game that you buy once and that’s it. I think there’s an expansion pack but it’s a single purchase. Whether that’s your idea of “casual” really depends on what you like. You can always play chill low difficulty levels when you need to zone out, and high difficulty levels when you want a challenge. It can get stupidly hard.
You can try a demo online at that link. It told me webgl wasn’t supported on mobile, but it worked pretty well for me just now on firefox, even if it was a bit laggy. It should work fine on PC.
I pirated it on PC after my kids told me about it and ended up buying it Three times on Steam and twice on mobile. It’s just that good. I’ve built a custom digital drum to play it and I’m now making a custom MIDI controller, so we’ll see if that does better when connected to the game.
The game works as well on mobile, if not better because the touchscreen is so responsive.