I chose:
UFO: for it's smooth gameplay and good complement with orbs
Wave: I like the zigzag movement and I love using it ok my levels
Ship: a smooth flying gameplay that can be used with orbs? Cool!
Spider: cool for ending levels
I didn't chose:
Cube: for me it's hard to make cube gameplay and most of the time it's just a repetitive or spam
Ball: it's really good for gameplay but I mean, I had to choose, ball or wave... OBVIOUSLY WAVE
Robot: meh, I don't like it too much, it's just a copy of the cube that jumps higher and it's pretty much as the cube in creating
Swingcopter: I mean, do i really have to explain why?