The guys from Pixjuegos have released a BennuGD tech demo for a platform game. It's still in a very early phase of development and I really hope that the graphics are not final but most of the gameplay is there and working well.
The interesting part is that all their code is open source and can be retrieved from their project page, so you can use it as an starting point to create your own platform games or as an entry point for BennuGD programming.
In case you want to have a look, a Cid2Mizard from Nintendomax has been kind enough to upload a video of the gameplay and upload it to Youtube: