It looks like you are placing the enemy but you are not placing the enemies vram. The object data for the levels are all next to each other like a array of objects. Map out the object data array for that level, find which object is the penguin vram and then place your new objects(penguin vram, penguin enemy) in the location that you want and it should work. I forgot how the levels set the starting vram for each level but it might also be in the object data array.
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