Wow, I was truly confused by this. I was amazed at how no matter what I did, I lost the level. I tried to collect only the blue bubbles, but my own power depleted. It kept saying I was closer to level completion, but that didn't make any sense. Every time I got closer, I lost health until I died. It's too inconsistent to recommend.
I guess it was fairly challenging. I just had no clue where I was going with this. The music wasn't that bad. The graphics were alright. I thought I wasn't allowed to go outside of those lines, not that it helped me much when I found that out. Not for me.