How about you do it safer, and make a "real" computer science course, and do the gamedesing part in paralel (as hobby, Indy or part time in a games company).

Then you have the chance to easier switch to a "real" computer science job
if you dont find something in the games industry,
or dont like it after a while.

A concentrated gamedesing education is also posing a high risk
as you specialize too much that early.