I wrote this on almost a haunted house story foundation. Get them in, constrain them and pull them in deeper.
I think I've run something similar as introductory adventure in format. One I padded out a little.
I wish I played up the puppet angle a little more. Scattered them around for a bit of colour, flavour, someone with a mostly appreciated sense of humour making the station a bit brighter. Or perhaps used them to be the occasional scare, like Jonesy in Alien.
If it does have a weakness, it is that you need a tighter grasp of the group. You have to be able to play with them. Cut off the right discussions and let the right discussions go on to keep the tone, tension.