I think it was Opus but can't remember the version. Would have been whatever was available in Claude Code in February.

Managed to find some screenshots. It did work but gravity wasn't really gravity - things fell at a constant rate. Turrets were floating in mid-air. It was missing the shields and you couldn't pick up the ball from the pedestal.

https://www.jamesdrandall.com/old-thrust/1.png

https://www.jamesdrandall.com/old-thrust/2.png

https://www.jamesdrandall.com/old-thrust/3.png