The site seems almost too simple to the point that players will start asking questions. There's no FAQ like veleten stated, and no provably fair mechanism on the site either, so players can't know if the game is legit or not. I'd suggest adding such mechanisms to the game and then relaunching it, as nobody wants to play on a game that isn't verifiably legit.
NAN of Undefined is likely just a site error. I also experienced this while staying on the page for a few minutes, but it should display __ of 25 spots remaining. I get 16 of 25 when refreshing the page.
I don't have Metamask installed, and I'm not getting any error message upon visiting the site and I also don't have an adblocker on.
Thank you for the feedback! I ran this game as a test for a week and has a fair number of people on Reddit test it. They asked for open contract code and it is available on Etherscan.
https://etherscan.io/address/0x9f23fa6156c7a845a30c70d4556670852fb16db2How else can I make it more transparent and friendly? I don't want to run away with money, my goal here is to see how people can apply game theory strategies practically.