According to an article in the APA's Monitor on Psychology, Psychologists don't think there's enough research yet on whether games help us learn or not:
But despite the growing popularity of such games, research has yet to determine whether they really help children learn, says University of California, Santa Barbara, educational psychologist Richard Mayer, PhD.
"When you look at the research reviews and meta-analyses that have been done, the evidence is not all that convincing yet that digital games are going to revolutionize education," says Mayer, author of the 2014 book "Computer Games for Learning: An Evidence-Based Approach."
Asking about common problems when learning using Yousician is really a separate question, but I think you should be aware that a major aspect of teaching a musical instrument in person is addressing the exact ergonomics, posture, positioning, etc. of the body parts involved in making music, and no game, tool, system, video, etc. can do that.