Bullets galore! We're developing a tool that allows easy experimentation and creation of complex bullet patterns. This will be especially helpful for bosses, or anything that spits out multiple, overlapping patterns.
Planning and clear vision is still a major part of the design, as you can see in the attack patterns on the massive floating temple structure. All the buildings will leave a nice flaming crater in the wake of your destruction. Watch out for sniper tanks that emerge from the buildings if you don't destroy them fast enough.
Lastly, more new projectile designs; various rings that shoot out of the temple buildings.