Level 19 feels like a reference to the Saffron City Gym from Pokemon.
Fun game, great job.
After playing this a bunch more I just realised this has a lot of qualities of solitaire. It's short, card-based, and somewhat based on the luck of the way the cards were dealt. Really enjoy it.
Thanks. That's a cool idea. I was thinking separate pieces like pawns that work for you, but your idea of upgrading the piece you're playing with is even better. Other enemy pieces could come in very rarely to up the challenge for when you survived for a long time.
Finally got around to completing a simple proof of concept of my idea of combining chess and classic puzzle games like tetris/puyo puyo.
There is still a lot to do:
I had an idea for something I wanted to make but your list of abstract properties of chess made me rethink that. What I have is just based on the very basic ruleset of chess.
But maybe I can incorporate them into my existing idea? Thanks for the thoughts.