There's nothing to forgive you for - hearing that is a great boost, not to mention the point of producing these videos :) Thank you!
I think that the total gameplay time was about two hours... but without save states (to restore after being set back by a survived fall) and the infinite lives cheat (to make the game possible), it would have been much, much longer. Somewhat unexpectedly, the game becomes much easier if you don't survive a fall, because you'll be restored to the last platform that you touched even if you just clipped it - if you fall down on those ice slopes at the end of level 10 and survive it, you've got a long climb back to the top.
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I think that the total gameplay time was about two hours... but without save states (to restore after being set back by a survived fall) and the infinite lives cheat (to make the game possible), it would have been much, much longer. Somewhat unexpectedly, the game becomes much easier if you don't survive a fall, because you'll be restored to the last platform that you touched even if you just clipped it - if you fall down on those ice slopes at the end of level 10 and survive it, you've got a long climb back to the top.