1. add more variation. every single level is just racing to get a visibility orb, but it would be a hell of a lot better if there were other challenges that involved that. maybe orbs that last longer or more hazards could improve the gameplay greatly.
2. more atmosphere, such as levels with weather and generally a better environment. it's very bland considering how every level looks almost the same. leave the character the same, but change the level designs.
3. add more interactivity. add things where you have to move objects by mouse to get somewhere, or goals like flip-switches. what you have right now is such an original idea, but it gets boring fast. there's no real difficulty besides the racing concept.
good, but could be improved