Thanks for playing and for the feedback as well. I will look into if it’s possible to login to NEAR through another window/tab or similar. I don’t know how well the NEAR integration works with itch.io, but I imagine it’s limited. (I provided separate testnet and mainnet URLs for the challenges.)
If you have a mainnet NEAR wallet, I can transfer one of the NFTs to your account if you want to try to change skin in-game.