I don't see what you've done as being wrong; native language ports are always welcome, especially if you keep them maintained. Under the MIT license I think that you are permitted to port the code, if you retain the original copyright. The MIT license is very liberal in what you can do with it.

I thought you meant that you were compiling objects into the application like folks do with Zlib and BZip2. There is a Pascal port of Zlib, but not BZip2 unfortunately.

I would be very interested in trying this out in the next 2d game I write. Must there be gravity, or could you run Chipmunk in space?