Aw, thanks a ton, that's really nice of you. I appreciate that. I am actually currently working on a new Gilbert game with exactly the things she's asking for. I've recreated Gilbert's neighbourhood only it takes place on a very colorful island. You can explore anywhere you want and run on top of roof tops and grab a glider and glide through the air or race around in a go-kart.
There's a bunch more to it ofc. It's currently in a pretty playable state and I'd like to invite you and your niece to play it if you want. I update the game regularly (I have a build up on itch) and I can really use some more feedback. If you're interested let me know, you can send me an email to joure.v@gmail.com and I'll send you a key for the itch.io build. :)
P.S. Regarding the VR issue. I have no idea why it's doing that. I surely have not done anything with VR in the game so it is a bit baffling to me. All I can say is sorry for the inconvenience.