Could it be the shadows aren't implemented yet? I played it til the current end but I didn't found it. I can't summon them, too.
Current summon list I know it works:
Press ~ and type
summon bp_crab_c
summon bp_gigante_c
summon bp_flower_c
summon bp_eggs_c
summon bp_fly_c
summon bp_octopus_c
summon bp_worms_c
Like I said, bp_shadows_c or bp_shadow_c doesn't work.
Worm is the only enemy with a battle fuck animation with impregnation you could escape. The other enemies have only an animation if you're defeated.
Gigante in the escape game can be theoretically defeated or "stunned" for a moment and be looted. But it costs many ammo. I recommend to ignore it and only fight the enemies on your way to exit and close the door behind you.