Worrying about tomorrow won't add any time to today, take a deep breath and remind yourself that God, is a God of time. You'll get done what you can and be proud of it.
Maybe this testimony will help encourage you. I prayed for time management when I taught overseas - I had 60 students I was teaching. I had to grade 180 tests for other classes, then check my 180 tests were marked properly. I had to input the grades, make 180 individualized comments for the report cards (one per student per subject). I then had to take down al my decorations, pack up 2 classrooms and move into a 3rd classroom typically on a different floor than either of my current classrooms were on. I also had to prep summer camp lessons and handouts for at least two weeks of class, and decorate the new room with 3d decorations making it look like something out of Disneyland with no resources or budget. (So a trip to the stationary store was in order on my time. ) All of this had to be done while being expected to teach my classes, keep up with lesson planning grading workbooks that were checked every 2 weeks for accurate marking/remarking or my salary got docked. I was also moving apartments at the time in my personal life and I only had 3 days to do it all. I was shocked when on the last day, I got all the school work done 30 min before school ended. I literally had nothing to do, so I could rest. I don't see how except it was a God thing!
Regardless try not to stress and just enjoy the process. Game making is fun right? ^_^