The list is crazy, so many niche platforms and limited availability:

• Glitch was a failed Fash based MMO, that launched as production release, was pulled back to beta 2 months later and then closed in late 2012. During this second beta they seemed to host a death cult. Its messaging framework was later rebranded as Slack
• Tenya Wanya Teens was designed to tour as an art piece last exhibited in 2014
• Alphabet was bundled with Experimental Game Pack 01, a promo for LA Game Space a failed incubator/exhibition space the broke up in 2018
• Woorld was a mixed reality game developed for Google Tango, a tech that hasn’t seen support on a new device since 2017
• Crankin’s Time Travel Adventure was developed for the Playdate and was featured in Season 1. This is still available, in fact it is a pack-in title with the Playdate.

I’ve just wish listed Wattam, its his only still available non-Katamari title that runs on a mainstream platform.