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well a few games with the monobleedingedge and unityplayerdll things are bright lancer, devil express, sclash and shinin blades (just picked randomly). there are some games that don't have the two files mentioned but still don't work although these are a small amount. when i download the game on the itch app im able to play these games with the two files. If unity has something to do with it could i possibly need to download some kind of unity application? 

Links would have helped, so I didn't have to go and search, but whatever.

Sclash is too big for me to check, but Bright Lancer and Devil Express both have executables in the archives. Maybe there was an issue when you unpacked the archives.