I went ahead and tried this on 1-1, just to see if it was possible. Only took 4 tries!
You will want to get your basic abilities before you attempt this. You will need your hover/fly ability and your dash ability.
The only tricky part was on the plant that unfurls. Swim under the first leaf and hop on the right side of it. Move to the very edge, then hop up and fly to the second leaf. If you try to hop directly to the second leaf, you will be too high and accidentally grab one of the ambers. When you're safely on the left side of the second leaf, you will need to dash underneath the floating ambers. This part is easier than it looks. The ambers will slowly rise and fall. Wait until they are at their highest point, then dash to the right. You will be able to get by without grabbing any.
Also, remember, DO NOT KILL ANY ENEMIES. Killing enemies nets you ambers.