Just played it through. It's definitely not Hard. It's Very Hard bordering on Lunatic. Luckily you've put in exactly the right amount of save points, so it's actually very playable, enjoyable even. One tip though - this is Knytt Stories - after all that effort designing and building the level, spend another couple of hours and make an Intro and Ending screen. I find it very unsatisfying finishing a level like this only to be greeted by the "you Win" screen. It can make the difference between a "good" level and "memorable" one.
Overall though a good effort.