So, the art-style definitely intrigues me. But I just could not figure out how to get past the first room for a long time. I think most people would have given up before I figured it out. Try and make the platforms that you can jump on stand out from the background more, so it's obvious that you have to jump on them. I would say, definitely get pause menu functionality in the game as soon as possible. And it would be REALLY helpful to see a screen that tells me what the controls are. And I would say take care with the camera shake. It's a bit disorienting.
But how long have you been working on this game?