Hello! Thank you for your request, it makes me happy you enjoyed the game enough to want more. Unfortunately, I don't think I'll be able to do this request. It would require re-modeling the character mesh, all the clothes, bones, animations, and physics, not to mention adding more pickups in the game to trigger. That would be a month or so of work, which is a bit much for a completed game.
That said, I have some good news. The next 3D game I'm working on already has some ludicrous sizes added in from the start. It won't be ready for a long time yet, but please follow so you can see when it comes out!