22-hour Osaka transit chance, how to make the most of your short trip

I bought a cheap flight from Incheon Airport to Tokyo, but I had a 22-hour layover in Osaka. First, I made a reservation for a place where I could easily go to Osaka Castle and Dotonbori. I arrived at Osaka Kansai Airport at 3 PM and went to Nagahoribashi where my hotel was. After checking in at my hotel, I walked for 10 minutes at 5:30 PM to arrive at Dotonbori. I rode a river cruise, tried the famous takoyaki, and had fun freely walking around Dotonbori. I walked to Osaka Castle at 6:30 AM the next morning. It was nice to be able to freely tour the quiet city center of Osaka and Osaka Castle Park. It took 30 minutes to get to Osaka Castle by foot, and it took 1 hour to tour Osaka Castle, so I took a morning walk and traveled for over 2 hours. Then I arrived at Kansai Airport leisurely and took a connecting flight to Tokyo at 1 PM. I had a satisfying trip of killing two birds with one stone with a 22-hour Osaka layover cheap flight.