I find it hard to beat Markor (available on F-Droid) for quick journaling on a phone.
It has quick keys for instant open note files and todolist files, and has customizable (and reorderable) buttons, including an available button that inserts the current date with one touch.
So in your shoes I would pull the quick date button to the start of the toolbar, and add dream logs to the Quick Note every morning.
So then the taps are:
- Open Markor
- Tap Quick Note
- Tap Insert Date (looks like clock)
Then type in dream notes.
- Tap 'Save'.
If Subnautica 2 delivers on the multi player co-op, I could see it joining my primary LAN party rotation. Exciting stuff.