why their is no workers in the game is because preview is relatively buggy
Note: I did try this on multiple devices with all maximized pages, and then one with one single maximized page instead. On mobile, the joystick disappears too. Very odd..
Try again but do not maximize any window, just play in windowed mode on all screens.
Check the movement group events and make sure you didn't change the events that came with the template.
If the template is working fine to you, that means you might have changed the template events, so double check.
There are no workers spawned because the host window was maximized, like i mentioned, try with all windows windowed.