Personally, I am fine with their flashlight brightness. It works a treat in my levels. But I can understand why you would want it brighter and it's always a good idea to provide controls so the end-user can change things, imo. Having said that, your last statement is not going to help or change anything as the TGC developers don't read the posts here ... at least not normally. This is a user's forum. If you'd like to see a brighter flashlight (or have controls to alter it so you can have a brighter flashlight), then head on over to GitHub and make a polite request for it:
https://github.com/TheGameCreators/GameGuruRepo/issuesIntel i9-10900K 5.10GHz, 64 GB RAM, Nvidia GTX 1080 ti 11GB, Windows 10 64-bit, dual monitor display