Houndeyes

Variants Suicide and knockback 

Bullsquids

voltigores

Antlions, Workers, Guards, Guardians, Grubs

Mr. Friendly's

Headcrabs, Poison, Fast

Boids

Protozoans

Snarks

Manta Rays

StukaBats even entropy zero 2 stukabats or green version of them  I forgot to put them

Chargers (a cut enemy)

It appears that once it notices the player, it was to charge towards them, wrap its head in its flaps (probably to increase velocity), then hit them with its legs at the end of the charge. Other animations show it "firing" with its mouth, likely some toxic spit in the same vein of the Bullsquid or the Antlion Worker.

Tentacles

gonarch

Barnacles

Reviver

Red Panther eye there also blue panther eye too

Chumtoad

Ichthyosaur

Archer

There also hive hand, shock roach, shock troopers, toothfins from entropy zero 2, Antlion king