3d is definitely harder, but its not impossible or anything. I was thinking of making a video talking through how the project was made as a learning resource if anyone else tries to do something like this.
The dash room seems to be tripping up a lot of people. We put in an 11th hour fix to make it easier, but it's still too hard. And yes, the main designer for that level does love precision platformers :D.
Honestly, I think the extra time spent building a 3d game was time we didn't spend balancing the game. Next game jam, I'm going to focus on building a simple 2d game and make it as fun and balanced as I can.