Quoted from bingopodcast:For iTunes, you must provide your artwork at a certain size and your feed must be 'iTunes-compliant', which basically boils down to some extra tags that no other application uses. I'm not sure if Soundcloud provides those or not, but most likely they do. Your feed only contains one episode, however.
Yes, the category placement and such can be handled from SoundCloud if you go to Settings under the "..." in the upper-right and under the Content tab (same spot as where you turn on the RSS feed). You can handle the podcast description write-up under Profile (just choose to Edit it and place your write-up in the Bio box). Display Name (same section) for podcast name, and your profile image will be your podcast image which iTunes should be fine with if 1400x1400 minimum.
I think all that will square you away with iTunes. I did not originally host with SoundCloud, but I'm there now, and when turning off my old feed sourcing and switching things over that's what seems to handle things under the SoundCloud platform (I used to directly write the feed settings via Feedburner, which is an option but if you plan to stick with SoundCloud no reason to change your RSS feed).
I also use Podcast Addict. RSS search found your feed (just shows the latest episode). I've subscribed and will give it a listen on my drive home.
Don't forget to report your podcast to the definitive list on this site, it's a directory of pinball-related podcasts: https://pinside.com/pinball/forum/topic/definitive-pinside-pinball-podcast-list