Is this even possible to obtain 15 items within the time given, on all systems? I feel like he moves incredibly slowly and the flashlight battery drains incredibly quickly.
You really don't have time to investigate so it's mostly clicking on a few things you know where they are, but all the items seem to be located rather far apart from each other (exception of 4 items right at the start). And even if you're being as efficient as possible, I still feel like you run out of time before it's possible to get 15 (or maybe even 10?). Best I can do is 9, so I'm giving 10 at least benefit of the doubt.
I have a sneaking suspicion this game plays differently in regards to timing based on what OS you are using or what browser you are using which, if that's the case, isn't fair.