• Kakuro
  • sudoku like puzzle game about adding up rows/columns
• Slice and dice
  • dice based rpg, may be a bit much on a slow phone, but timing doesn't matter so it could work
• Melvor Idle
  • Runescape idle, basically an rpg idle game

There's an idle game called "smashing simulator idol" and in it, all you do is break pots and pans that fall from the sky by tapping/clicking on them. It's simple and extremely addictive.

80 Days is a neat game with a cool setting. Not free though.

I’m gonna throw in for Zachtronics Solitaire Collection.

Most of Zach’s games are about engineering assorted things to meet demands like speed or efficiency, but he would always bundle a fun and thematic solitaire variant in with his games.

This is all the solitaire games collected, with all the engineering cut out. I’ve probably put a couple thousand hours into it, and since it’s just in my pocket, I can pick it up and play while waiting on food and such, playing before I sleep, and just random games of solitaire folded throughout my day.

(My favorite in the collection is Fortune’s Foundation, a Fortress variant that puts away a whole tarot deck, major arcana included.)

• Polytopia
• Simon Tatham’s Puzzles
• Tiny Town
• Downright

I have 0h h1 and flow free. Pretty small and graphically simple but good fun

Dungeons of Dreadrock was a nice puzzle game. I spent a good amount of time on that.

I suggest downloading roblox, sure it has a lot of garbage games but it has some hidden gems