Following an upload to device via the simulator (macOS, 1.12.0), I'm consistently getting a device crash during the "Unmounting" step.
The device shows an animation of falling blocks and states, "Sorry, your playdate has crashed" Pressing A to restart repeats the cycle and a paperclip reboot is required.
The game is successfully installed and available following hard reboot.
We have a bug that causes a crash like this when your game's title contains spaces. You can work around it by temporarily renaming your game; hopefully we'll have a fix out in the next patch. Sorry about that!