Thank you very much for your comments.
I uploaded a new version with better anchor presets for the UI and subtitles to understand the story and know when to spam space ^^. It should be a much more playable experiment now.
About animations, background, colors and lightings, it's definitely a problem of scope. I had planned to use Mixamo but was unsure of how to export correctly armatures from Blender to Unity. So I preferred to finish the gameplay than the arts. But I'm on it for next months XD