Yes, there is sooo much to improve. This first attemp was about creating atmosphere rather than high quality graphics. The main issue about that regards is I'm a solo dev with almost-zero art skills ;) Additionally, chromium-based browers screws the output when activating SSAO (which gives a better looking aspects regading illumination, if you want to compare download the 0.2 windows version) .
Thanks for your feedback, i will start improving my shaders skills.