Also, not sure what I messed up.
but I got to the demo's end, replayed while keeping the equipment.
anyways, in the dna screen, I somehowmanaged to get an empty slot "equipped".
(the forth one in the first row on the left)
now no matter what slot I am on and press E, nothing happens.
cant "unequip" that empty slot, also cant equip the swarm slot on the right.
must have messed up something.
which makes thing ugly for me since my strategy for parasite second phase is based exclusively on the grounded swarm attack... :-D