After you did his date fight with him, hang with him and Vandeel and eventually Vince will invite you. You need to do Vandeel's 2nd gameover where he's trying to tease Vince with you around so Vince will be more forward with you.
holy fuck I'm stupid my screen has a black box sitting in the corner where the transition for switching maps is and I didn't realize I had to click it. I've had the mines unlocked the whole time I'm a moron TT0TT
