This looks really good! You definitely created some strange places, judging from the main menu and first level.
I did not go past the first level. I fell a few too many times and don't like run backs (especially in a game jam setting where there are a lot of games to get to). But that's potentially a skills issue on my part!
This is a critique of a lot of games, even some of my favourite AAA ones: it often feels like the speed I go when holding down shift key should actually be the default. I end up with my pinky finger locked on shift most of the time.
Otherwise I think you've done a great job putting this together in a week, and it looks like other players with better 3D platforming skills than mine seemed to enjoy all the content hehe! Well done :)