Browser-era creature-battler music that actually put in the work. Every zone gets its own battle and exploration themes, and they're distinct enough that you can tell where you are just by listening. "Apollo Nox Zone" has this mysterious, slightly ominous atmosphere that shifts into something more aggressive for its battle variant.
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"Emerald Isle" goes tropical and bright. The Aerobia tracks split into east and west themes, which is a nice level of detail for a free-to-play game from 2012. "Ice Tower Zone" does the frozen dungeon thing but keeps it rhythmic instead of just ambient wind sounds.
Solid genre work throughout. If you ever sank hours into browser RPGs and want to remember what that felt like, this'll take you right back.