Thanks a lot for such a detailed feedback!
I just procrastinated on the audio effects, BGM is not my expertise but I think I should at least use a free asset if not an original song by an artist.
Menu was mostly done but couldn't figure out the last piece in time, Godot seems to have a system for menu, but I do plan to add it.
Yes I also felt dying could be very abrupt, something like stop gap on hit like smash bros is something that would convey the hit properly.
Yes , I don't know what all goes into level design and I have barely have any practice, this could be something that I could spend some time on this game to practice.
There were some ideas which could make it faster and force user to use all movement utilities using layout of level and star system.
I made the large level on last day with almost no thought and first thing I thought was jumping down from the cliff, but it would be hard to do since I didn't plan for it at the time, but that sounds nice.
Multiple possible routes and letting players experiment would be the ideal way forward to level design.
Thanks for all the points, it was great food for thought!