We revamped the spike level's difficulty, as it was meant to be a tutorial to how the spike mechanics work in our last UX pass. A few of the "frustrating" mechanics (such as bubbles spawning on top of active jellyfish) have also been removed.
The last few levels are still a bit challenging, which, with a restart option on the levels, should give it more of a "puzzle" feel. We hope that the skill curve between the levels feels a bit more natural now.
Thank you and others who pointed that out, and left good and honest feedback - Yaniv