I don't know if this will work for this particular game, but for some other games this issue with controlling the mouse is a macOS permissions issue. To potentially fix this, go to System Preferences > Security & Privacy > Privacy, then select "Accessibility." Under "Allow the apps below to control your computer", find Steam and make sure the box is checked. If it's already checked, go ahead and uncheck then recheck it. You'll need to restart Steam for your changes to take effect.
Please Note: This Forum is for non-application specific questions relating to installation/configuration of CrossOver. All application-specific posts to this Forum will be moved to their appropriate Compatibility Center Forum.
CrossOver Forums: the place to discuss running Windows applications on Mac and Linux
We're rebels. We're misfits. But mostly, we're software liberators. And we're very, very good at what we do. We have to be. Lots of developers work with open source, but only a tiny fraction of those are good enough to get software that was designed for one platform to work on another one. We invented CrossOver software - a unique approach to cross-platform compatibility that does not require dual-boot or another OS license. We launched PortJump to help app and game developers broaden their market beyond Windows® users. And we launched ExecMode to help organizations solve really ugly technical challenges.