Hello Friends!
I just published a demo version of GB Rober on Steam! It features shorter versions of the game's four main stages (the final game has a total of nine stages) and takes around 20 minutes to complete on a first playthrough.
If you play it and have any thoughts, or encounter any problems, feel free to stop over in the game's forums and leave a post in one of the respective threads!
I hope you'll have a good time with it and thank you very much for your interest in my game!