Some key points to take away:
- The Gorge is a combat engineer, not a fighter. Use Spit to ward of marines, but don't expect lots of kills.
- Heal spray can both heal fellow aliens and help to grow structures quickly, such as Harvesters.
- Hydras and Clogs are most effective when moved around the map to trouble spots, on the front lines. Leaving defences in your Hive is usually not the most effective strategy. Move them around!