The basic elements of ambient are there, a near drone, slow shifts (not modulations) of harmony....
I suggest you slow it down by a good 20 to 30 %!
The reason is that for ambient, your harmonic shifts happen, imo, at too rapid a rate of change, giving the listener a feeling of activity and change rather the opposite of what you want 'ambient' to be and do.
Since it is all electronic, a click or two to adjust that tempo is simply done to make a slower -- and more expansive sounding -- version. I strongly recommend trying it.
Best regards.