Nice work! The effects and sounds were well done. I tried to keep building towers forwards to the enemy base to try and destroy it, but seems like that wasn't the intention haha. Good job!
It is the intention, and it's not that difficult to destroy the nest. Just put machinegun towers around it, and make sure you have enough credits because it will adapt its behavior (no more cooldown between waves, and hornets will target attacking towers).
The area's limit is behind the hive, but there's room for a tower or two. I have to improve that part, areas where towers can be built are not obvious enough.