There are multiple ways to move around in CaptureAge so make yourself comfortable!
You can zoom in 250x in with mouse wheel up and zoom out to 0.01x with mouse wheel down. There's also a toggle allowing you to zoom in and out smoothly by pressing x.
Scroll speed can easily be adjusted in the settings menu by clicking on the gear icon by the minimap.
Zooming sensitivity and camera sensitivity can be temporarily slowed a little by holding Ctrl or a lot by holding Ctrl + Shift.