it just feels weird that there is just one tutorial level I guess. I wonder if it would be better if the tutorial and the main level were on the same screen? I don't really know what say in these situations, I agree there should be a tutorial somewhere in there to address potential ambiguity of what the win condition is, but at the same time, most things are either a standalone level or part of a set of levels.
perhaps you could just add one line of lore before and after, to increase the sense of compleation.