We’re not able to comment directly on individual apps and accounts on the forums. This is why we direct you to the platform support forms by default in cases of application suspension.
You’re specifically stating that your app’s account is having features restricted, which sounds to me more like an account interaction and behaviour issue more than an application problem, and I’d therefore suggest you check this page and follow any instructions related to appeals there. So far as I can tell from a brief look, the account only appears to quote Tweets, so that’s very likely to be a reason it may have been flagged, but I’m not an expert in this area. Check the email associated with the account for any additional notices.
Closing this thread, as we’re unable to do more here.