It looks good, it hits the premise pretty well and the controls are fairly solid - the only thing I'd say is that the game gets kinda samey after a while? Ultimately it's just looking up at the sky and pulling the trigger, which kinda loses its lustre after a little while and means the player isn't really looking at the cool environment work you've done which looks really cool. Maybe have the enemy move around at different levels of the Y axis too so that there's more opportunity to check out the things you've made.
Also for the future, it might be worth implementing a cooldown period after the player dies, just because I found I got stuck in loops of respawning a few times in a row.