Hey @cass, that's awesome man, good choice of colors, the logo is perfect is not too big or small, but I think the rounded bottons should be without border because they are too small and the border is to bolt, and in the image numb 4 if you make the logo with the same dimensions with the botton it will be better separated like this logo │botton, and you can use a shadow to make it better.
And thank you for up-voting my comment on @steve-walschot post and apply my ideas : the round corner.