I started playing Freedom Planet for the first time on hard a few months back. I do this with most games and later turn down the difficulty if it gets to be too much and I'm not having fun. It turned out to be a very hard game, but I was having fun so I drop down to normal. I took a long break and just got back to it tonight, when I pushed through the last three levels.
To give some sense of the difficulty if you haven't played the final boss's third and final form had one attack that would do enough damage to reduce you to one heart from full health, and he starts the battle with that attack a moment after you can move. You have to attack at the same time as it to parry. If you miss the parry you can only take one hit before death, and he will keep using that attack.
The final score screen says I died 440 times.