The vibe of this game is great! Of course, you know about the collider issues breaking the game already.
I think you are just a little practice away from a solid Trijam entry. You already have a good development process to be able to put this together within the three hours. Tasks like picking the right type of collider shape, camera sizing, physics tweaks,.. they all become so much faster and easier the more you do them. If you keep iterating through your process, you're going to have great Trijam games (and others) really soon.
I loved the witch cackle timing :D