Im so happy I found this!
I have been developing homebrew rules and additions with a physical version of this game at work with some coworkers for the past 3 days since I watched Riffle Shuffle & Roll's [Video]... And have been interested in maybe creating a full Belatro-style sim to play within as I LOVE the physicality of the game irl and the way Belatro translates that physicality into the virtual medium is great. But this version of the game you have here really showed me the fun of having it be snappy and fast when it comes to gameplay loop.
Fun fact, Ive been collecting decks of cards since high-school,... stacking up more than 30 various collected decks, the added face cards and other mechanics have been really fun when I can implement them so clearly and easily with different color or styled cards haha.
I actually also heard from this game on the Riffle Shuffle channel. I immediately fell in love with it and just released my Android version: https://play.google.com/store/apps/details?id=ch.klemensforster.rascalsgambit