Campaign 2 is intentionally a bit harder than the first one and all feedback on difficulty levels is welcome. Are you stuck in a rut with your strategy, trying slight variants on the same plan, or have you been trying wildly different layouts and loadouts? Mixing things up a bit can really help.
General tips that work for me:
– Upgrading a tower is generally more efficient than building new ones. Sometimes an increased rate of fire from added low level single-target towers helps, but if you’re filling the map with low level towers it’s probably not a good plan.
– If your setup is doing a good job of killing things, don’t spend cash on towers that aren’t necessary right now. Building up bank will earn you more interest so you’ll have more to spend when it’s needed. You could also get your repair drones out early to start harvesting more cash even if your barriers are intact. If you’ve got a nice stash of cash built up and a wave of enemies catches you by surprise (a boss, a new type of critter etc) you can pause the game and lay down defences to deal with the specific threat.
– Position your towers so that enemies stay in range as long as possible. As well as covering as much path as possible, this includes building by barriers where enemies will cluster, and using slow towers to hold critters in place. Don’t underestimate the slow!
– Use your ship weapons! The Aurora armour’s aura (try saying that quickly after 5 pints…) gathers ship energy rather than buffing towers, so expect to be a lot more active with your ship weapons in Campaign 2. If you know your towers are weak against a certain type of enemy (eg flyers, amphibians), be ready to nuke them with ship weapons when you see them in the Next Wave indicator.
– If a tower has outlived it’s usefulness don’t be afraid to sell it. You’ll make a loss, but it can still fund defences in a more useful spot. This usually happens when a barrier breaks, making defences around the choke point lose efficiency.
If you let us know what Armory loadout and strategies you are using we can discuss it in more depth. Feel free to post screenshots of your layouts if you like 