Flood mode is very fun but it needs two signifigant changes.
1st The flood should not be allowed to swipe while thrusting. This is the biggest problem and is op for the flood.
2nd The humans armor ability active camo needs to be removed. This stops the flood from being able to lunge making it gamebreaking. Also the ability is already bugged (crouching right before you activate it makes you invisible but does not give you the blue dots on the mini map. You become invisble on both the field and the radar.
A replacement for active camo would be hologram.
Please post your own changes if you have any.