The indie developer confirmed the new ventures during a speech at Gamelab 2012 this week, Eurogamer reports.
"I'm working on two games with friends," he said. "I started working on one of them during the development of Fez, but I had to leave it to focus on finishing Fez.
"It is difficult to decide which game you are going to dedicate to, it may be something that will occupy many years of your life."
Fez, released for Xbox 360 in April, was recently named among Digital Spy's 'Best Games of the Year So Far'.
Fez is available to download through Xbox Live Arcade.
> Read Digital Spy's review of Fez
Watch a trailer for Fez below: