This is a really fun game! :> Very addicting, indeed. The negative cards definitely help with the possibilities with the gameplay. Only bugs I managed to find was sometimes negative cards would send the current hand score somewhere in the 900s, instantly losing the hand- and the score is cut off on top while in fullscreen. Overall though, this is a really cool submission!
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Thanks for playing and the bug report!
A hand score in the 900's is likely a bug with the math used for figuring out which value should be used for the different Ace cards you currently have in the hand. I need to revisit that function to figure out where it's failing out, but appreciate people finding it so that I can tidy things up, lol.