I absolutely LOVED this, even for how simple it is right now! I really love the style of switching between blue and red. I appreciate how both views have a theme, like blue has walls and platforms, while red has enemies and health. The game felt very connected, and I instantly fell in love. The enemies were a decent challenge, only offering you a few hits until you die, but being able to one-shot them made me feel powerful and allowed me the element of surprise. I know that this is just a simple demo, but there are a few things to look out for. Firstly, the jumping was inconsistent, and sometimes when I jumped at the edge of a platform, gravity pulled me down twice as fast and killed me. I don't know why that happens, but it seems like a bug. Sometimes when landing on a platform, my velocity would slow down a lot until I hit it, which led to a weird landing feel. I know this is a browser-hosted game, so performance isn't the best, but I saw that shooting too many bullets at once tended to lag my game. Having a recital to help aim would be nice as well at some point. But other than that, I genuinely loved the feel of this, and I would be excited to see more updates if you plan on it. Keep up the great work!