Hunicke, who prior to joining Thatgamecompany in 2009 worked for EA on the likes of Boom Blox, revealed the news in a post on her blog. She was instrumental in Tiny Speck's recruitment last year of Katamari Damacy creator Keita Takahashi.
Recalling a visit to Tiny Speck's Vancouver office, Hunicke writes: "It would take quite a long time to tell you about all the delightful people who I met that day. And even longer to explain all our wonderful conversations we had about Glitch and what it means to them. But let it be known that they charmed me completely!
"When they told me they had an office in San Francisco, where folks were joining up to imagine new fun for Glitch… well, I must admit I swooned. It's hard to believe that by simply visiting a friend [former EA colleague Justin Quimby], I found a whole new world. But sometimes, when we're lucky, life really is just that magical."
This is the second high-profile departure from Thatgamecompany this week: yesterday we reported that co-founder Kellee Santiago had also left the studio, though she did not reveal her next move. Yesterday, Journey was named the fastest-selling PSN game of all time in the US and Europe.