This game was really funny, I got softlocked when I died at the alien level but it was thoroughly enjoyable swapping your different cards. My favorite one was definitely the robot one I think you should incorporate that kind of mechanic more into the fights instead of solely the RPS stuff. (or different flavors of it, like giving bosses certain card patterns)
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Ah ! You are totally correct, seems there is no fail state text for that level which means you get stuck if you lose. Unfortunate for that to slip by and thanks for reporting. Appreciate that you enjoyed the game, each boss does have some for of point and click aspects to their level but we very much recognise that communicating that to the player was not great.