I really liked the story, the writing and the art (silly as they are). I don't mind the sound. Dubious educational value. :)
I don't mind the big challenge. The controls make the challenge a bit bad (the controls were way too weird around dashing into enemies imo), but what made me stop playing is that pressing R to retry makes you go through all the dialogue again. That might be okay on earlier levels, but when there's lots of spikes and insta death, it just becomes annoying. Also WASD would have been nice.