Another angle: could the user be referring to something like Rocket League Sideswipe, the mobile game? But that's 3D. Alternatively, maybe a browser-based 2D version? Let me search recent news. There was a Twitter/X post in 2023 about a 2D Rocket League parody called "Rocket League 2D" by a developer named @RetroGamingDev. It's a browser game made with Unity, using 2D sprites for cars and a simplified physics engine. It's not official, but it's a fan-made project that went viral on TikTok and Reddit.
