Changes
Added various insects to each region
Added lily pads floating on top of the water
Added swarms of fish, coral reef and algae underwater
Added seasons (winter, spring, summer, autumn)
Implemented seasonal temperature in each region
Some trees turn color during autumn, and die during winter
Flowers bloom during spring
Fog and mist now vary in density across the four seasons
Foliage now interacts with the snow, becoming frosty during winter
Updated length of days and nights to vary with each season
Made day and night lighting more dramatic
Added more foliage types to landscape grass (bushes, ferns, flowers, tall grass)
Improved foliage wind animations