All in all, I enjoyed your game.
Controlling the platform is a nice feature with which I think you have implemented the theme of the jam.
I like the sound design very much. Especially the music is great. It's not annoying but it fills an emptiness that would probably be there otherwise.
I don't have to say much about the graphics either. Looks good. Only thing is, the barbarian doesn't really fit in with the rest of the game. There you have chosen a relatively modern graphic style, next to which the barbarian looks like stolen from a NES game.
But what I really like is that the platforms outside the tower turn into clouds.
But I have to disagree with almost everyone here in the comments section. In my opinion, the barbarian did not jump too fast. The only thing that felt weird was death. To be more precise, I think the spider is moving upwards in a fixed time? For me it would be better if it was always at the same distance from the players. So that you can fall down maybe 3-4 platforms before you die. The way it is, dying felt random.
But this is complaining on a high level. I had fun with the three levels of your game.