For anyone wondering how to fix the files and be able to play the game:
1st: put the MirrorMaddness!! Platformer Game.exe into the other file, where the unitycrashhandler32.exe is
2nd: rename BlahBlah to MirrorMaddness!! Platformer Game_Data
3rd: thats it, you can now play it
Don't change the files that unity gives you, try practicing a bit so you're ready for game jams, and try My First Game Jam, it's a good 2week started jam.