I think this app is pretty cool. I decided to pick it up for my code club, and I think the students will like it as much as I do. I haven't been able to do much testing because we're not meeting in person at the moment, and teens usually join from their phones. I had some issues with the redemption process, and they helped with it right away. I hope that the Nonilion team continues to work on this app, it has a lot of potential. I think the UI and overall function are pretty good, I really like the theme. The UX could use some improvement, it seems like I'm not the only person who had trouble with the account creation process.
I'm curious to know what the issue is myself. Is this just an AppSumo account creation problem or does this happen when someone creates an account through the Nonilion app/website?
One other thing, I think it would be awesome if we could add our own sprites and slogans. Maybe this is possible already? Im not sure. As I mentioned, I haven't had the time to play around with it much.