It would be very hard to find a unique style doing 2D flat art using Illustrator in this way. People have been doing this kind of thing for over 30 years using this software.
On your art,
Faux Pas #1, you have a raster outer glow on the moon, a drop shadow on the back and some kind of hazy something around the perimeter of the back circle. Transparency/raster effects = Total fail as 2D flat art.
Faux Pas #2, your moon is on the right, and so are your shadows. If the moon is there, artistically, the shadows should throw left.
I had no trouble seeing the wolves on my work monitor, but the contrast could be improved.
I didn’t particularly have a problem with pines being lit from the top. They are thinner up there and let light through, though again, they should be darker on the left side as well as the bottom. I do have a problem with your use of a gradient . They are out of place as flat art. (see #1 above.) Though they seem to be more commonplace than they used to be.
Moon mountains and trees seems to be a common theme for this type of art.