I get your point, but pointing out that a tech demo isn’t a full game yet doesn't really add much. What matters is that the core systems (movement, opponent behavior, rendering) are already in place, which is usually the hard part. That's exactly how games start.
Also, considering this is written by hand in assembly on real Amiga hardware, without any framework (aside from a small c2p.library I made available with source), it naturally requires a lot more time to develop.
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Yes, it is an impressive technical demo (as I stated), and it is certainly the start of a game, but it is not a game quite yet. A game would have a win and/or lose condition (especially an arcade game, as this is an arcade game jam), and I couldn't see that here. It is entirely possible that I somehow missed the win/lose condition, in which case I will take back my comment entirely, but from the version I played I didn't see those, I was able to move on a map, but I couldn't win and I couldn't lose, it was like I was in a sandbox environment.