Ah yes I wrote that in sequential order as I played so at first I didn't realise he was the first enemy as he didn't do damage and later discovered he appears in the later stages in huge quantities and will be responsible for my many deaths XD
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I think he didn't do damage because I already killed him before he was perhaps able to detect me? So maybe that's why it didn't do anything, I'm not quite sure but it was why I thought he was one of those environment pet thingies haha. Regardless, every one else I encountered after that moment did do damage so maybe I wouldn't fret it. But just to answer you, it was the very first one I encountered in the blue area, on a lone platform on my way to the top right of the screen.