Neo Jakarta is an interesting setting, but the game can deliver the setting outside the actual gameplay itself. For example, an entirely different scene with background images or actual character showing something instead of just text. It's a lot of work, I understand so I give the setting a thumbs up for originality.
In terms of gameplay, you can at least make a panel or two showing the control scheme to act as a tutorial. I can't actually figure out if the speed of a marble was determined by the "length" of the arrow or the amount of time you you hold left mouse click.
Can't speak much for music or art because I'm a big idiot in that area, but I like the art style looking edgy and a bit futuristic. The text can be improved though, either by using just one font for everything or make clear distinction when each font are used (The "victory/lose" text is a mixed of two fonts).
Overall, a cool game with interesting setting and concept, with a need for a bit polishing.
Best of luck to all of you!!
Edit: The skills. I have no idea how it works and what it does. The GDD doesn't specify anything as well.