I got the red X one time, but after that I could input as many numbers as I wanted and nothing happened. Hope you get it sorted :)
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Hmm... Tried playing the game on itch both logged in and logged out but I can't seem to replicate this error. Very strange. I'll try and look into fixing it but I'm not sure if you're allowed to update your game during the voting period of the jam I submitted this to :(.
(You know me from your Discord server though, so is it okay if I DM you to ask you some more questions about this? I don't want to clog up your comments section.)