So no new sex scenes yet also will we get a boss wave soon
Not true. The melee mechanic's hitbox is janky and the swings hardly ever hit.
Even on lower levels of the wave, the enemies will swarm you before you even get four solid swings in.
That means Melee has to be slightly reworked a bit.
Still, the grenade strat DOES work, especially with Impact Grenades... As long as you figure out the arc properly.
The Impact Nades seem to have a reduced arch, meaning they will explode in your face if the enemy is too close.