there's a demo of it running on https://nycki.net/qrplay !
nycki
I'll add a few of my own:
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PlateUp! It's like roguelike Overcooked. Upgrade and build your own kitchen as the customers come faster and faster, try to survive long enough to earn five stars.
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LevelHead, its like indie Mario Maker. Play as a delivery robot and escort the package to the flag. The package works like the companion cube! You can throw it to deflect bullets, or climb on it, or drop it on a button, etc. Level editor looks good too!
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Shütshimi, its like Wario Ware except it's a shmup. Swim through waves of enemy fish, get a powerup after each wave, but think fast, you only get five seconds to read what the items do.
"personal" and "trustless" seem sort of at odds here. you want personal data, so you want personal storage.
what I recommend, if you have the time and energy, is to find another self-hoster you trust and be "backup buddies" with them. set up remote file storage on both your networks and send your backups to the other person's server.
if you can't find another self-hoster, then find a friend or family member you trust and mail them your backups on a physical disk.
ooooooh that's really good though!!! i considered raw audio but it seemed like it would take up way more space, but kudos to you for doing it anyway!