Normal route is really fun. Akane, Lucia and Chihaya's routes are undoubtedly the best part of the game. Kotori's route is good but has a lackluster ending. OST is really great at times but some songs are uninspired and sound like royalty free tracks.

Overall despite calling myself a Key fan and a fan of this VN, I can only recommend it to those that are interested and are fans of Key. Don't go into it expecting anything groundbreaking outside of Akane's route. The final route (Terra) was disappointing even with low expectations.

My route ratings:
Akane Route: 9.5/10
Lucia Route: 9/10
Chihaya Route: 8.5/10
Kotori's Route: 7/10
Moon: 7/10
Terra: 4.5/10
Sizuru Route: 5.5/10