You did well finishing this prototype and sending into the jam!
Based on your work, I have a few tips and tricks that could help further developing this type of game!
Basic:
The camera felt a little... Well, it caused me some nausea while going through the map. This happened due the camera being stuck on the character, which is a physics based object - Then, whenever it tilted, the camera did too... For most kinds of games, this can cause some bad things on the player.
To fix this, it would be nice to have a individual object following the main player, without physics, where the camera is attached. Then the player would not see the jiggle whenever a object is hit :) You could also eliminate the rotation on the Rigidbody constrains!
Intermediate:
It feels like you are using something like RigidBody.addforce() to move, which accelerates slowly the object, making it go faster with time (usually without a cap too). For platformers, usually what you want to do is having a constant force being applied, suddenly, for the feeling of natural movement..! There are a lots of cool things you can try to do with rigidbody physics lol
I wont delve further on these concepts because I dont know if you would like to receive them, and I am a little afraid to go by as boring lol
Nice prototype! Keep on making games and hope to see you on other jams!