Neat game! I like the shield mechanic that makes it more of a pacifist survival game than a traditional shooter. However, I do wish I had a health bar of some sort. It was kind of a bummer to die out of nowhere with no indication that you were close to death. Nevermind, I noticed in a later playthrough that the opacity of your shield was your "health" indicator. That probably could have been made more obvious. Either way, I liked the idea and the pixel art was cool. Good job!