According to Pavlovic, the independent developer is looking to distribute, market and self-publish its future endeavors. Its first three games were backed by Sony and released as PlayStation exclusives.
The investment will also allow the studio to "scale up development efforts" on its next game, an unannounced project "in the same spirit as Flow, Flower, and Journey."
"Since finishing Journey, the team has been hard at work to make an emotionally engaging experience centered around human connections for players of all ages and backgrounds," Pavlovic wrote on the studio's official site. "We’re eager to share more information with everyone as we get further into development. Until then, a big thanks to everyone for your patience and ongoing support."
Pavlovic told The Verge that Journey's response convinced the studio, which also raised $5.5 million in 2012, to expand the scope of its first self-published game.
"We had the choice of taking on a simpler project and making it easier on ourselves for our first self-published project," she said. "But the public response from Journey a few months into development convinced us we had to keep pushing."
For more on thatgamecompany and its future endeavors, be sure to read our interview with co-founder Jenova Chen and our coverage of his talk at the Gaming Insiders conference last year. You can also read his thought about what a social game should be, delivered at the 2014 Games for Change festival. For more on thatgamecompany's last game, you can read Polygon's Journey review.