My question is on the shards. does every level 15,24,32 and so have just one color of shard? or do they have each color to make the relic?
I mean dou you have to go to several different planets/cities over several levels to get each piece?
Yes, you have to go to several different planets to get the shards. Some planets have one, some none. You need three to make a matrix cube. A poster above has listed the combinations. Level 15 take one of each color, 24 and 32 take 2 of the same color plus an additional one. The level 50 ones take 3 of the same color and you will only find the third color on high level planets.
Here is a guide