@DonFletcher pretty confident. I think house mouse can be ruled out pretty easily based on what @81mv has said, though it would’ve been easier if we could see the tail also. I think the shadows may make the head stripe less visible, but I think it’s worth noting that in my experience (living on a property where we find dunnarts from time to time) I have found that as a general rule the head stripe is not super pronounced in any individual of this species in the area (but this is just my personal experience). I would be willing to call it.
@81mv where is its tail please, I cant see it? And are those eyes really different to a House Mouse? The habitat is wrong for Antechinus and I think the snout is not pointed as much as Antechinus. I think the contest would be between Common Dunnart and House Mouse but the animal in the images seems to lacks the head striping of a dunnart, which I would have thought could be readily visible in a dorsal closeup view such as this. Also its nose seems less pointed than a dunnart but I'm unsure, depending on the angle ...
@Liam.m how confident are you about Common Dunnart?