Note: I won't be counting Non-damaging structures, nor the snake for obvious reasons
v INDEX v
Bee - tiny Jungle enemy spawned from small hives
Wasp - Small Jungle enemy spawned from large hives
Boom Beetle - Medium enemy spawned from Blue Hives, Explodes on death
Transmitter Drone - Small Drones that guard transmitter towers and shield generators
Cannon Turret - Medium Structures That fire explosive projectiles
Defense Turret - Small Structures that fire lasers
Lava Ray - Medium Lava enemy spawned from Lava caves, Fires heating projectiles
Lava Bombers - Medium Lava enemy spawned from Lava Bomber caves, Explodes on death
Hammer Heads - Large Lava enemy Invincible from front, Charges dealing massive damage
Juggernaut - Large Practice enemy found in Test flight, Resistant from the front
Fighter - Small Practice enemy found in Test flight
Other
Firefly - tiny projectiles spawned by lava rays
And of course, Let me know if I missed anything, and I Bid you adue