This game is fun. It is really satisfying to clear a sector or to eat up multiple sharks! :-)
It offers a lot of risk / reward decisions. Saving the mega-eggs for later can be considered as resource-management. There are also multiple strategies possible: Clearing sectors and getting the corresponding bonus vs. only following the very long lanes of eggs which is the faster way to increase the total-clearance-percentage.
I set myself the goal to clear the board on "beginner" difficulty. Let's see if I can do that (record so far: 52%).
The sectors are well designed. So I agree it is better not to generate them. However since all sectors are squares of the same size you could consider to randomize their positions and orientations. This would increase the replayability.
How can I activate the Xbox 360 gamepad controls?