FYI there is a community called !opensourcegames

not the answer you are looking for. but this may be interesting to those who are looking for a way to play games on android without sacrifying privacy.

Lemuroid is an open-source emulation project based on Libretro. It’s completely free, without ads and focused on ease of use and good user experience.

Supported Systems:

• Atari 2600 (A26)
• NES
• SNES
• Game Boy (GB)
• Game Boy Color (GBC)
• Game Boy Advance (GBA)
• Sega Master System (SMS)
• Sega Genesis (aka Megadrive)
• Sega Game Gear (GG)
• Nintendo 64 (N64)
• Nintendo DS (DS)
• PlayStation (PSX)
• PlayStation Portable (PSP)

you fan find it on f-droid

tetris
https://f-droid.org/en/packages/org.blockinger.game/
not quite the same.

Edit: Oh sorry, the ask was for Libre, not just a good matching game.

I enjoy the fudge out of: “10000000: The Dungeon Crawling Matching Game”

I played it on iOS years ago - but it seems to exist on Android as well :)