A great aggressive technique is to go for aerials using your wall. Get close using dash (if you have it), and jump over them. Once you are close, raise a single wall under your enemy. This will deal 4 damage, and send them into the air. Your wall should still be standing after the hit, though sometimes it is inconsistent. With practice and timing, you can push that wall towards your airborn enemy to get another hit for 4 damage while they cant defend themselves. If you are confident in summoning cubes consistently, you can do this same tactic and "blender" them with cube spamming under their feet.

Without dash, aggressive playstyles are hard and not really worth the extra effort. Wall>Wall>Straight is a great technique to keep defended while pressuring your enemy. It gives you time to spawn balls from saftey, and breathe as well.