The original version of the ROM had a bug that could cause this as I didn't own an Everdrive for testing. If you downloaded the game prior to October, try downloading it again and it should work now. I just tested it on my Everdrive to verify and it worked right away without any issue.
Spoony Bard Productions
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Sorry, I can't update existing cartridges because the new version uses a different mapper. I'd need to replace the board inside the cart, so between that and shipping the cost would basically be the same as getting a new copy of the game. The only real differences are the animated background tiles and two player mode, which swaps the active controller when you switch characters at an igloo. I'll gladly give anyone who bought the cart a copy of the new ROM though.