Pine forest: Intense, this track builds up very nicely. The drums and fast arpeggios contrast nicely with the slower arpeggios and define well less intense and a higher intensity moments. I assume that is what they mean?
Shopping time: My personal favorite. Nice and relaxing, I like the percussion rhythms a lot here too.
Frozen waterfall: There is a nice transformation from the softer beginning to a more dramatic shift. There is some very cool effect here (modulation?)
Full Moon Thunderstorm: Also a nice relaxing track, I like the flute-like synth especially.
Overall, a nice listen, well done!