Visually one of the best agdg demos I've played, gameplay felt pretty smooth as well. I think the player character looks really good, I love the attention to detail where he'll point his gun towards the camera when the cursor is over his body. I also loved how the enemies burst into giblets. The only concern is that it might be a little too similar to Metroid given that even the enemy and UI designs are pretty close matches to their metroid counterparts. It could detract from the feeling of exploring this alien world because of how familiar things look & feel right off the bat, but that might just be a nitpick.
Either way great demo! I look forward to seeing more from this game.