Oh wow, I think you got the mood right. The shapes moving between the trees, the music and the darkness were spot on! But for the gameplay, I just couldn't understand what was happening for a long time, I started blasting randomly and heard the sounds, see the number rising and I understood things were dying, I just couldn't see what or where. Eventually I managed to see some shapes moving, but the screen was so small and everything is black, and the shapes move really fast too. I never managed to spot a shape and shoot it by reaction, I think I just managed to shoot things randomly. You say it's your first game, so congratulations on getting mood and ambience right! Good job!