Feral Heart

I've recently gotten back into map making, but-- After I exported my latest map, I can't open my game. I've taken everything related to the map out of the FH folders, unistalled and reinstalled, but it's still not working. It's not even giving me a "Cannot Open" or "Page is unresponsive" message or anything, just black screening then closing.

I don't really know what else to try here, please help. c':

I changed my username and I cannot login.  I tried emailing the address but it wouldn't let me.  I've also logged into the website platform many times on multiple devices with the new user. It's just not working on the game itself.  I'm not sure if it's that though.  I just downloaded the game onto a new computer, so I don't know which it is.