No, it has no limit. But you need to find somewhere to host it. So, you're asking if there's any way to upload a scenario to the Greenfoot site that is larger than the maximum size allowed on the Greenfoot site? The answer is no, of course not.

Bench try using Scratch, its a simple website where you can make scenarios similar to Greenfoot but less complex and more basic, but that's the only other one i know, and hey can you try out my game? Street Racer X i want to know if i did good because i dream of becoming a great game programmer or designer or even a company just as powerful as Nintendo someday. Its my first game and i wanted to know how i did so Bench please give it a try

for web hosting, i recommend amazon AWS. they have a great service called EC2 which is free for a year and will essentially give you a remote computer you can run a server on. its somewhat complicated, but there are some good guides such as this . it may be difficult for many people, but it is a very useful thing to know how to do. using this method would probably be the best solution (not necessarily the easiest) for creating a small and simple website for this purpose. as an easier solution, you could also just share the project as a jar file and post a download link for it.