Hi - are you guys talking about creative writing, or critical response?
If you're talking about creative writing - you don't actually have to write an imaginative journey per se, it just has to be a journey, any kind of journey physical, inner or imaginative. It can blend elements of all three and you don't need to specify that it is an imaginative journey.
add to that the fact that basically anything you write will be "imaginative" because u will use ur imagination to create it, you should be fine.