Crsldmc: +1 would love to know aswell I'm stuck on level 6: Hunt in Hard Mode
IAmSinistar: Wise from your gwave!
Oldish thread, but I've just started playing the game myself last night. Similarly stuck repeating level 6 over and over. I have a basic approach for dealing with these floating bastards, but it's not enough to get me all the way through. But in general I believe you should either get behind cover or tether yourself with a gravity hook when they start the suction effect. Do not fire at them in this state, because the will just return your projectiles back at you afterwards. When they are vulnerable, try to hit them with mortar rounds, and otherwise snipe from around the corner with nano shots. I can almost get them all using these strategies, but usually screw up somewhere and fail before completing the level.
I just get frustrated with those little basterds, your idea has logic all around, the thing is like you said "don't screw anything up" which is kinda difficult hehe.
I'll try once again and see how it goes.
Cheers mate!