Hey!
I think your game is missing some files and it won't run. In a game i built recently i had these files:
- name_Data
- MonoBleedingEdge
- name.exe
- UnityCrashHandler64.exe
- UnityPlayer.dll
Also, it would be better if you uploaded it all in a .zip file, because the browser might complain if you try to download an .exe directly.