Update: New .pdx works great, but it made the cover on the playdate app selection screen a little less wide.
That was my error. I was building in a dirty git tree. I've released 1.0.2 (version 6 on itch?) with a fixed card.
I just tried to install 1.0.2 (version 6) on my unit (running OS 1.11.0) and I'm getting "There was a problem installing this game" on the device itself, when at 100% installing.
I've released 1.1.2. Please try and report back. Full release notes here.