Looks like the enemies can't actually kill you? The ground sure can though lol.
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Huh, just tried it again and, sure enough, this time the first enemy killed me. Odd. I only noticed it with later enemies and that's when I actively tested it and both the enemies as well as bullets just went straight through me. Not sure if something is wrong with the scene setup or there's some bug after respawning or something, but they definitely didn't hurt me later on :o