3 Weeks in September: FIRST WEEK Osaka

This September I will return to Japan for a 3 week holiday. I was already in Tokyo for 2 weeks in 2016 and visited almost every major district in detail. This time I’m travelling with my mainland Chinese girlfriend, who I finally managed to convince to come to Japan with me (she has a lot of prejudices and everything is better in China anyway, blah blah blah). Maybe I can convince her on this trip that Japan is a very cool country to travel to. We both live in Germany.
I thought we would land in Osaka and then spend a week each in Osaka, Kyoto and Tokyo with day trips to Nara, Yokohama and Enoshima/Kamakura. Due to a knee problem, I am not completely unrestricted in walking long distances or up many stairs, so we will refrain from hiking or anything like that.
My girlfriend doesn’t really expect anything from Japan and according to her, she doesn’t really care about anything, she just follows me around and will probably mainly look for food and makeup.
I’m mainly interested in the country and its people and the gaming scene, i.e. arcade centres and retro gaming shops. (Found many interesting ones in Kyoto.) But I will probably go into every bookoff I see.
My planning for Osaka so far (first week of the trip) is as follows:
1:
\- Kainsai One Pass ICOCA Card at the airport (maybe buy and use Haruka Discount Ticket ).
\- Take Haruka Express to Osaka (or cheaper regular train).
\- Check in at hotel and freshen up
\- Explore area (Shinsekai) around hotel.
2:
\- Aquarium
\- Temposan Market Place (shopping mall and restaurants)
\- maybe Ferris wheel
3:
\- Osaka Castle Park (Litte Train 300Y) (we are not interested in going into the castle)
\- Hep 5 Shopping Mall (and Ferris Wheel)
\- Osaka Station City
\- Umeda Sky Building when it gets dark (6.19pm) (-10% with Kainsai One Pass)
\- Pablo cheesecake (Until 9pm)
\- Dotonbori in the evening (maybe River Boat ride)
(Glica Man lights 9pm off).
4:
\- Kuromon market
\- ABC Mart Namba (maybe ABC-MART Shinebisubashi shop)
\- Some Ramen shop
\- Nipponbashi Denden Town
5:
\- Shitennoji Temple (small entrance fee)
\- Mamba yaska Shrine
\- MEGA Don Quixote Shinsekai
\- Round One Store (open around the clock)
6:
\- Amerikamura
\- Shinsaibashi PARCO and district
\- Shinsaibashi Shopping Arcade
7:
\- Mini Pig Cafe
\- Abeno Harukas (-10% with Kainsai One Pass) (sunset 18.15)
\- Sumiyoshi Taisha Shrine
Any ideas, comments or advice on this?