I liked how you used the same tiles scaled to different sizes, it gives the game a unique look and is something I wish I'd thought of :)
I too fell foul of the door bug which was a shame as there's some really good platforming action going on in this game. The movement of the character felt right and the hammer attack didn't feel too slow, so it felt like it just needed a bit of good timing. Platformers like this rely on good 'feel', and you nailed that. I wouldn't worry about posting a bugfix, even in the most strict jams, bug fixes are usually allowed, and this is far from a very strict jam! :)