You are right, there are strange muted pauses in the video that confused me.
Ah ok, the videos are just me trying to showcase some gameplay as quickly as possible, so I press the start button as soon as the title screen appears. Nice to know you can hear the pieces, in the video here for example, the loading screen music (which starts when the Ham6 screen appears) is quite long but i pressed the button to switch to gameplay, so the loading bar appeared and music stopped