Cant change "default" 1280x720 resolution

The "cursor offset" is unfortunately caused by Windows display scaling, to fix it, please try this: Go to your game directory, rightclick on the "risingworldx64.exe", select "Properties" and go to the "Compatibility" tab. Check the "Disable Display Scaling On High DPI Settings" box, save the changes and try to run the game again. The problem should be fixed then.
About the errorlogs, they indicate that no matching fullscreen mode was found (combination of resolution, refreshrate and color depth). This happens sometimes when using a TV instead of a monitor, for example, or when an "interleaved" refreshrate is set for your screen. If it still crashes when selecting the desired resolution (2560x1440 or 1920x1080), try to disable fullscreen mode, adapt the resolution to your desktop resolution, and check the "Undecorated" box in the settings. This provides an alternative fullscreen mode, which works much better in most cases.