Nebex's "Weightless" is three short lines, and almost nothing happens in them. The speaker looks at someone, and the next moment they are flying. The poem skips any explanation of how one leads to the other. That jump is the point: seeing her is enough to lift the speaker off the ground.
The feeling is the giddy lightness of being struck by someone, whether it is love, longing or simple wonder. The title makes the sensation literal, and the speaker doesn't seem frightened by it. "Flying away" could even suggest escape from everything else, though the poem doesn't say what.
The mood is open and calm. "Endless sky" gives the poem a wide, quiet space to end in, and the short lines let the reader float a little too. Nothing is resolved, and nothing needs to be. The poem simply holds onto that moment of lift.