I thought about being able to hit in a different direction than facing, but was kinda lazy/didn't find it necessary. I kinda think the game is complex enough as-is. Maybe a better indication of where the character is facing would be better?
Anyway, are you currently being killed by the "bombers" at around 5 sec? You may not have realized you can dash past them and let them explode! Dash has long range and is good to abuse of, it also passes through (most) units :D