it was really fun! especially regarding having boss enemies that you have to think out of the box for a moment on how to defeat them. I only fought the fire guys so I don't know if you have other versions of bosses, but I'll definitely try to give them features to tap on the player's available cards. maybe some enemies that are healed by poison and so on.
overall I really liked it but I don't know if you're planning on infinite mode as the only means to play. I kinda liked the level structure on the tutorial. I was enjoying the puzzle approach way more than the "infinite run" one (although it was fun to see that much variety in a single play too).