Not a problem. I'm happy to give my feedback on something I had so much fun with.
Upgrades:
Yes, to view which ones I have currently installed. Correct, they are shown in the upper-left when viewing your deck. My issue is that after so many loops through the game it will very likely be the case that I will run out of room for them in such a small horizontal space. That's all. It'd be nice to see their art in original size as well. That's why I was asking for a separate screen for them, pretty much identical to how you view your deck.
As far as the upgrades in the store, I never ran across one that increased my max HP (that would have been very useful!) but perhaps that's because I didn't buy every single upgrade that was offered to me, only the ones that seemed worthwhile. But yes, during my 2nd loop the store offered not one but two Steroids cards for my characters to purchase, even though I already had one installed on my Ninja.
Version:
Ahhh, I see. I currently have version 0.719 so perhaps that bug did in fact get fixed. I'll keep the F8 reporting function in mind in case things happen again. In the meantime it seems I need to download the newest version. I suspect that means it'll restart my progress, which means I still don't get to try out that third character yet LOL.
Also, nice to see a developer responding to feedback! Good on you :)