Thanks for your feedback :)
We're french and use AZERTY and didn't really thought the game would be tested by non-azerty users aha. On our keyboard, the camera rotation would be exactly where you're asking it to be. In the meantime you can still play with a gamepad if you want ^^
I'll try to make an update with the texts translated and a control remap so that people can choose how they want to move.
About the FPS I'm really sorry, I'll try to look into it, I haven't done any optimisation about the HDRP part yet so I think there's something to do with that !
Thanks again :)