Because I was too quick to start playing I missed the instructions on how to shoot, so it took me some tries. It would have been nice if they were written out here. The enemy spawn was really hard but after that they were kind of manageable to herd around. So maybe it would be nicer to have less dense wave to both keep it interesting while running with a trail and not having it that hard during spawn. Another small thing, I would have liked there to be some delay between death and replay, or that previous score was visible somewhere in the game afterwards. Other than that I quite fun and challenging arcade game. It would be cool if the shadow was important somehow (regain health in it or something).