Stardew Valley

Templar Battleforce is a great little turn based strategy game with a squad of persistent troops fighting across missions.

Smart audiobook player, fit notes. That's all I got and they're kind of niche

MiXplorer: Tabbed file explorer with many features. You can get it for free from their website, but it's available paid on Google Play.

Symfonium: Music player compatible with many backends, such as local storage, WebDAV, Subsonic (which includes Ampache, Navidrome)

aCalendar+: Calendar app with many widgets. Best part is the persistent notification, which shows what's happening today, and will happen tomorrow.

Cryptomator: Cross-platform file encryption program, also open source.

Cryptomator is a fantastic way to securely upload your stuff to cloud storage providers like Google Drive, OneDrive, etc. In my case, I use it to have an encrypted blob of my stuff with me on a drive when I'm out and about.

They also give you the ability to purchase a license independent of Google Play if you didn't want Google to get a cut.

Threema!

FL studio is pretty good. Got it ages ago and it still gets updates

Others have recommended other file explorers, but I use FX and rather like it.

If you're a fan of customization and getting your home screen just how you like it, KLWP and Nova Prime.

Nova Prime is a launcher with a bunch of customization options for how your app drawer works, how apps are laid out, how big they are, how folders look, etc. I use it for the fact that i can set folders to have the icon of the first app inside, and a gesture so that tapping them opens that app, while swiping up opens the folder.

KLWP is essentially Rainmeter for Android.

If your device has stylus support I recommend Artflow for drawing/image editing

just scrolling trough my phone, here's some I like

app opps - lets you change permissions for apps, handy if you want to have multiple things playing audio or use google photos without it scanning your phone.

calcu - it's a calculator!

simple draw - exactly what it says on the tin

es file explorer pro - versatile, but not bloated

moon+ reader pro - a handy reader for all sorts of docs, including search etc

polarr - a photo editing app with features not a lot of apps have. The devs are pushing some dumb filters tho

handy photo - same as polarr

mx player pro - got videos to play?

poweramp - a music player

poweramp equalizer - is what it says on the tin

sd maid pro - for clearing out old files and such

poweraudio plus - used to be the only app with a parametric equalizer. Now poweramp does too

ultrachron - just a nice timer/stopwatch

unified remote - a remote control app, be careful tho, I doubt this thing is secure

web video caster - also downloads videos from plenty of places

and a couple more apps, where the developer has decided to pull the lifetime license and move to a subscription, even after I had bought it

officesuite pro - it's handy, but f them