What do u get more from up game level?

Apart from coins MAX increase, darts MAX increase, any others? incubator reward different?

You get more DNA from incubators at a higher level
At level 15 you get

Oh great, so the number of dna received also increased from all incubators.
Also, apart from creating new creatures and fusing which i know can increase game levels, what else i can do to increase faster.