If the app is acting oddly, press the Playdate's
menu button to pause, then press the
d-pad up to highlight "wifi", then press the
A button until "upload log" appears and press
menu again to unpause. Wait minute or two, and the log file of the current session will be uploaded to the server. This will help the developer track down the issue.
(Oh, and if the app crashes, the log file will be automatically uploaded the next time it runs!)