Well considering you are just starting, lemme give you some pointers to get a better star rating.

1. Add Music
2. Add Sound
3. Add Some Graphics
4. Add Some Special Effects
5. Add A LOT more then what you have.

As a developer myself, to keep a person interested, your going to need A LOT more then just a red block and a black area to walk in. Even with what you call "secrets", secrets are suppose to be extra things within the level to make people want to find them, not so they can move on to the next level.

I love games like this, simple yet very addictive.