Looks very nice.
Maybe add some people walking the path (dont even need to interact with anything), it gives more life to the simulation.
Once I can afford a copy of Poser, I’ll try to make some people sprites. I’m quite bad at animations though, but practising to make animated people is on my list since a while. I was also thinking about adding some animals, must see how far I’ll get with those ideas 
Snails and slugs are easy enough to animate for sure, since they only slide ;D
You clearly need robots to defend the garden.
Little tanks to shoot flak at gnat swarms, and others with little flame throwers to roast the evil bug clone armies. Robot snakes for underground hunting of moles fro9m the dark-side, and quadrocopters which can bomb ant fortresses. Though little helps against the termite rush on their buzz saw blade bikes and the hungry swarms of armor plated locusts :persecutioncomplex:
And finally the garden will look like the moon with it’s dust, rocks and craters …
I think that is meant to be another game 
This is beautiful and awesome. Keep it up!