Whoa, this is very underrated, this is so good!
The reason It didn't preform very well is likely bc it takes a long time for gameplay, castle is like TikTok, any decks with long unskippable cut scenes, especially from the start, usually don't preform well in the algorithm :(
Don't let this discourage you, keep making amazing decks! Tip that Iv learned after using castle for almost 3 years. The first 10 seconds are the most important seconds of your entire deck, If the first 10 seconds isn't engaging, then by default 60% of people are just ganna scroll. Its stupid but that's just how castle is :(
Good luck and I wish you well on your other projects! π