I've played hard games before. Challenges can be fun. But this...this is just wrong. Most of the game is easy. I've got Gold ranking on every level. I have best time globally on some of them. However...the final boss. I don't have a ranking for that, because I can't beat the second half of it. It would be fine if it was just hitting the enclosed targets while s*** gets tossed at you/ you get warped around by tiny suns. It would be fine if it was just Having to beat amped up versions of previous levels. Combine those two, and add in the stupidity that you can't assign jump to X, and the difficulty spikes by a factor of 100. It makes the falling rocks + rising spikes from the end of the last level seem fair!
To sum it up, the developers clearly don't want the ending to be seen by 99.9% of players. This is a real statistic, according to trophy data.
The day after tomorrow shall be today!