great little platformer but as everyone is saying its too hard :( I think the difficulty could be fixed if the jump was just a little bit higher because it doesn't feel good if you only just make it to a platform and have to push to actually get on there especially in that last boss fight. while it doesn't fit the theme that well the bosses I think do fit it very well and I saw you said you focused on gameplay more than implementation of the theme and I think that paid off because you have all the core platformer vibes perfect (apart from maybe slightly too short a jump :p).
overall very well done I think this is one of the best of the whole jam :)