So before I go too much further, would it be possible to use this for web apps or unity games?
Web apps, almost certainly no.
ClusterFuzz (and fuzzing generally) is most useful for finding bugs in C/C++ code so maybe it could work for unity games?
I don't know much about them though.
Although the engine is currently written in C++, they are in the process of rewriting parts of it in C#, with help of their HPC# subset and Burst compiler, having some ex-Insomniac Games developers like Mike Acton on the team.
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Web apps, almost certainly no.
ClusterFuzz (and fuzzing generally) is most useful for finding bugs in C/C++ code so maybe it could work for unity games? I don't know much about them though.
I thought unity was mostly written in either C# or an EcmaScript flavour?
Unity itself (the engine) is written in C++. Game scripts are written in either C# or UnityScript iirc.
Although the engine is currently written in C++, they are in the process of rewriting parts of it in C#, with help of their HPC# subset and Burst compiler, having some ex-Insomniac Games developers like Mike Acton on the team.