Hi, first of all I have to say that I'm really impressed with the application. After trying it for 15 minutes I had to buy it. This is so good and almost everything that I wanted (that I know of).  So, thank you very much for the app!

I'm coming from DeoVR and I'm on Quest 2 so my comment might not be correct but even if the saturation, gain & contrast are working very well I would love to be able to go further. The colors feel too saturated by default (I know I can change default value) but I feel there is also too much red by default (again, same as before :)). I don't know if DeoVR never managed color properly and if I just discovered the real colors of the VR movies, but the result feels strange to me. I would love to be able to customize more the colors if they are indeed managed properly by default (which is totally possible).

Would it be possible to add more options like Hue, a simple gamma (even if your gain works really well!), maybe be able to go further with gain and that kind of stuff?

There are more color settings in the advanced video settings. You can control each color channel individually, and there's also gamma and offset settings. There isn't a hue setting, but you should be able to get similar results by adjusting the individual color channels.