It's not pik'n'mix - all the singe files are in the repo you listed above: https://github.com/DirtBagXon/hypseus_singe_data
If you start mixing files up, who knows what state you will end up.
Get the repo zip, then find, or recode, the required video/audio - that's it.
I have all the Singe 1, HD Gun Games on a Sinden RPi and Singe 2 conversations on the Windows PC from that repo.
If you want it handed to you on a plate, then Singe2 still wins, but for the bells and whistles, and new Daphne games, you need to read up a little.
Note: There are 3 different versions of TimeGal in the repo, maybe the video you have is from a different version?