Right now, I'm playing SuperEpic: The Entertainment Wars. It's a metroidvania game starring a racoon and a llama. The basic plot lampoons those crappy freemium games on your phone like your typical Bejeweled or Bust A Move clone with microtransactions. The game is really fun, and has an extensive combo system that's kind of fun to use, and figure out all these different combos and combinations you can use.
Ironically, there are sections blocked off by QR codes that you can scan, and when you do, it takes you to Regent corp's crappy games, and when you beat those games, you got a code that shuts off the barrier. The games are short and don't outstay their welcome, so this ends up being in a surprising and fun gimmick, and it's kind of humorous how they lampoon those games by having fake stores within the game with fake microtransactions that do nothing if you try to buy anything, but poke fun at how far microtransactions can go by buying difficulty modes and higher graphics and whatnot. Also, one of the games is a Bust A Move clone where the theme is Up on the Housetop. Maybe they missed an opportunity to use the song Bust a Move, or they just couldn't get the rights.