Do the negative fluctuations that occurred in the game and application programming project, after things initially became easy and the young man stopped studying, mean that he chose the wrong option, or are his sins—especially masturbation—the reason for the withholding of sustenance, and what is the way to deal with this matter?

Quitting your studies was a wrong decision. It would have been possible to combine your programming hobby with your studies, and then develop your programming skills further through more study and specialization. It is advisable to resume your studies and continue your hobby in a way that does not conflict with them. You must repent of the sin and strive against yourself to get rid of it, while persistently making supplications and associating with good and righteous people.