Windblown plays really well on the SD. Developed by Motion Twin, same folks behind Dead Cells. Rogue-like that plays similar to Hades but has some persistent upgrades like Dead Cells.

Yes. I have a Pi4 running NextcloudPi image on it. I sync docs, pics, even backup my Obsidian vault. It’s worked really well for Quillpad in my experience. On desktop I use Iotas (Linux) if I need to update from that instead of my phone.

Quillpad is the closest I’ve found. It’s simple markdown files. It can sync with Nextcloud as well. I use it for any short note or lists. Long form stuff including journal, I use Obsidian (not open source)