In Klonoa, do I unlock anything by collecting all gems?

In Klonoa, you can collect up to 150 gems in a single run in each level. Once I've collected 150 gems in each level, do I unlock anything new?

Solution 1:

For the most part, no. Only the Phantomilians matter. However, if you collect all 72 Phantomilians, you are rewarded with an extra level.

Collecting all 150 gems in that level, rewards you with an extra cutscene after the level is complete.

Also, I'm not sure if this was in the Playstation version, but in the Wii version, collecting all 150 crystals in a stage turns the map icon for the level blue rather than a grey crystal icon which you get if you collect between 130 and 149 crystals. I don't know if you would consider this an unlockable though since it doesn't technically unlock anything.

Solution 2:

No, nothing special happens for getting 150 gems on a level (or all levels).