Quirk of the coding i'm afraid, the jump actually executes 0.1 seconds after you release the key as thats the only way i could think of making it work, thank you for the feed back, which ending did you get?
I feel you could fine tune it to reduce that 0.1 seconds and still make it work well since that was one of the biggest issues in my opinion. As for endings, once I got over to the ice area I just ran across the lower ground the whole time till I hit the end. So I got the ending that corresponds to that location.