Cool game, i really like the 'flail-absorbtion' idea. Keeping the power-up from level to level could help flatten the difficulty curve a bit, the jump in difficulty for the third level is brutal :D
We did plan to keep the powers across levels especially for the introductory levels, just didn't make it in time!
The second and third levels were thrown together about 15 mins before deadline in parallel by two different people and entirely untested, hence the spike :D