traveled a number of times with Willer from Kyoto, Osaka, Tokyo <-> Kanazawa anything specific you wanna ask about?

I sat the relax seat a few times, can recline all the way down. Pretty comfy to sleep and the seat width is just alright for me (I’m very thin). The only con for these seat is that if anyone around you (back, side) wants to go out, you have to get out of your seat and probably wake the person in front of you to adjust their seat.

Japan bus driver really professional. During night time It will drive more slower compare daytime. It purposely drive slower do avoid vibration and bumpy ride

looks ok to me...

but sifus here may have more suggestions

Take note after landing in Kansai, you'll need +-1 hour to clear immigration. And depends on your personal preference, I'd like it better if ride the Ferris Wheel at night.

landed 9.20pm reach hotel 10.30pm? impossible la... from the time you come out come out from plane till u exit custom & collect your luggage already almost 1 hour. and i assume you stay at namba since you said you going dontombori. JR train may took 1hour from kansai to namba and nankai express train took 40 mins.

Kaiyukan Aquarium & Tempozan can get special price ticket that cheaper a bit.

last day seem quite rush for me bcox the area you going like Left, Up and Down of Kyoto

Check with the hotel if got late checkin fee.

I went there during normal weekday. Got queue la... But the queue move quite fast. Get my ticket in 10 mins to 15 mins like that. My sis went there during christmas day more crowded but like 30 mins get the ticket d.

i took nankai express from kansai airport to namba...and reached my airbnb which is located nearby JR namba around 12am...

I thought you're expecting to arrive in Namba at 1030pm, but you've already corrected it to 1130pm. So that should be fine.
I think it's a day pass, not sure. Probably can do a quick check from Klook.
The last time I went, there were no queue at all (it was Monday evening). But buy from Klook can get cheaper a bit.