Reminds me of snake/tron, except sometimes you and your enemies can go through your tail. The base idea is really cool, but I would have liked to see more telegraphing about where enemies will spawn before they start moving. As it is now, you can't really do anything if you're out of position when they spawn. Have you considered having the player destroy themselves if they step on an afterimage that matches themselves like the enemies? Either way, really cool concept.
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We do have some tweaks to enemy spawns to telegraph them more that will be in the next version after the jam, as well as enemy directional indicators so that you can tell what direction enemies are moving when time is "stopped". Having the matching tail segments kill the player is an interesting idea, I'll have to try that one out and see how it feels.