It's literally just a case of dodging them. I suggest putting on all of your movement speed gear (having defense won't really help you) for maneuverability and then running from one side of the room to the other. That's how I did it.
As for #3, you have to protect the cake jelly rabbit. As a result, I'd use any ranged weaponry you have and just shoot the correct switch. The way it works is that say, for example, the pink rabbits flock towards the cake, you hit the pink switch. (This then dispels the pink jelly rabbits.)
#4 is a case of just hitting the rabbit. When you hit them, it gets knocked backwards. All you have to do is keep hitting it backwards in the direction of the portal. (Just move yourself around the rabbit to aim, then hit in the direction.)
I'll try record myself doing it if I can find where I buried fraps on my computer and upload it to youtube.
| GSBlade 8X SS | Crystallite 7X Mystic | xSwiftie 7X DS