This app was mentioned in 10 comments, with an average of 1.70 upvotes
I don't know about homebrews campaigns, but the official app with two campaigns for the base game is this: https://play.google.com/store/apps/details?id=com.fantasyflightgames.rtl
You can't play as overlord with the app, only as hero.
Are you aware of the app?
https://play.google.com/store/apps/details?id=com.fantasyflightgames.rtl
Also on Steam
https://store.steampowered.com/app/477200/Descent_Road_to_Legend/
I love it. Best expression of the genre imo. Plays solo well with the AI.
I think people have answered most of your questions, they are revising arcade mode as we speak and there are updated versions on the web, basically they agreed that there is something wrong with arcade, and want to fix it.
FWIW Descent 2 has an app that will GM the game for you so you can solo it, or just play he heroes. iOS / Android
Hey if someone can suggest Mansions of Madness, then I can suggest Descent 2nd Ed. Until recently, they have an app called Road to Legends that acts as a DM for you, providing enemy AI, fog of war, and campaign management.
Descent 2nd Ed is basically DND Horde Mode with a more simplified combat system. Of course you'd have to buy the boardgame itself if you want to use it. Road to Legend even includes a Delve Mode (but its locked behind a Paywall I think) which is basically a storyless dungeoncrawling mode where you and your party can go deeper and deeper.
Mansions of Madness is cool if you love Lovecraft, but Descent is the straight up Fantasy RPG equivalent.
There is going to be a <strong>light Gloomhaven version</strong> next year.
But for something that can be bought right now I would join the recommendations for Descent. It can be played as one vs many (for up to 5 players) or cooperatively using this companion app (up to 4 players, there are also Android and iOS version). For something lighter and cheaper <strong>Ravenloft</strong> or any other <strong>D&D Adventure System games</strong> are good also.
One Deck Dungeon didn't click for me, too long for what I expected. There is an app for it that is currently on sale (also for Android and iOS) in case you want to try it.
Edit: Bolded
Seems "The Delve" is now available - see latest Google Play update:
https://play.google.com/store/apps/details?id=com.fantasyflightgames.rtl&hl=en
"The Delve" is now available - https://play.google.com/store/apps/details?id=com.fantasyflightgames.rtl&hl=en
Don't forget there's a companion app now https://play.google.com/store/apps/details?id=com.fantasyflightgames.rtl