This game has been bugging me for a long time, hope that someone knows this.
This game was on a demo cd that probably came with some magazine, I believe the year was around 1998. It was a 3d third person adventure game, and the demo level was on some kind of island with a beach and a volcano or a mountain in the middle. The player was maybe a friendly looking alien boy or something? There were piggies on the beach strolling around, and if you jumped on them, they would first cry, and then rush at you angry. There were rockets about the size of big fireworks that you could get and fly with them for a short while, from one rock in the water to another, collecting coins or stars or something from the air. If you fell to the water too far from the shore, a big fish would eat you. There was also a big space ship on the island, I think you had to get on that to progress? When the demo level was done, it showed images from the full game, and some later levels were in a space ship. The game was colorful and graphics cartoony. I somehow associate a star with the game, maybe it was in the game's name or desktop icon or both?