hello matthaeus,
it's a sweet tune
also, even such a small and simple piece shows your potentially large creativity, in my opinion. i especially like measures 6-10.
hope to hear more from you.
you can find attached my fingering for the right hand. i've done it from work (where i have no piano) so i'll check it when i'm home, but it should be fine. i'll also do the left-hand fingering at home as well.
alternative fingering for measure 16 could be 4 3 2 5 2 1 2 4.
keep up the good work
i think you should already start writing yourself two-hand etudes