Psyonix's hit soccer-with-cars game Rocket League has passed a new sales milestone. VP Jeremy Dunham told Kinda Funny Games that the game has now hit 10.5 million copies, with the total number of registered players hitting almost 29 million. That figure includes free copies of the game given to PlayStation Plus subscribers on PlayStation 4 at launch in July 2015, as well as split-screen players.

About a fourth of the 29 million registered players (around 7 million) played Rocket League in February, Dunham said. More than a year-and-a-half after launch, the game's playerbase continues to grow, he said, which is part of the reason why Psyonix is not going to make Rocket League 2 anytime soon.

"Why would we want to take this huge community that we've already built, that's still growing, and say, 'What you're playing now is going to be irrelevant in 12 months, but we want you to stop what you're doing, giving us money all over again, and move over to this other game,'" Dunham explained. "That's not the right way to do things. I think that era of games has passed."

Dunham added: "Our goal was to keep making Rocket League better and better so that we don't lose any of the people that want to play. If they're playing our game, we're not going to penalize them and make them buy our game again just because we want to add a couple new features. We want to let them know we're in it for the long haul, if they're in it for the long haul."

The executive went on to say that Psyonix is thinking of new features for Rocket League that are one or two years away from release, so you can expect ongoing support for a while to come.

Also in the interview, Dunham said that Psyonix is approached by publishers on a regular basis regarding partnerships. With an influx of resources from Rocket League's ongoing sales, Psyonix does not necessarily need to partner with outside companies as much as it used to, Dunham said. Before breaking out with Rocket League, Psyonix did a lot of contract work, included contributing to the multiplayer modes for Bulletstorm and Mass Effect 3.

Rocket League is currently available on PS4, Xbox One, and PC.