Perhaps you are a
Between you and your feelings, Or perhaps you and your grudges,
I was thinking "distance" or "space", as in "put some distance between you and your feelings", but I couldn't make it work. Can't make sense of this one.
I lie upon large puddles, and ward off constant nudges,
Clouds, in the form of fog, can lie above ponds, lakes, etc. "Ward off nudges" might refer to the fact that in this form clouds do not bump into one another.
In my depths many appear, look out across the moors,
In the sky can be found many clouds. To convince yourself, look across a field.
While from atop a shadow crouches tinkering with lures,
A reference to a dark storm cloud, perhaps. "Lures" may refer to the fact that the cloud attracts positively charged particles from below (see below).
My yard is proudly flat compared to roaming hills around,
The sky is "flat" compared to the geography below.
Orbs rising in the rain, with their charges not aground.
During thunderstorms, positively charged particles rise and travel with the moving storm.