Hello, sorry for the late reply. We usually come to itch to make announcements and post about the game but our official way to give support is through discord: https://discord.gg/qTx9Csv
About your freezing problems, we haven't tested the game with the video card you mentioned so we are not sure if that's your problem. If you could reach us on discord to make a bug ticket it would be great for us to help you as quickly as possible.
About your flickering mouse, it's the first time this bug is reported to us. We already have plans to add a setting to allow players to change the input sensitivity for both mouse and controllers but please understand that our game has not been fully released yet, this is in an early stage of development and many changes and improvements will come in time.