Great progress! New levels are pretty cool!
New controls feel a slight bit awkward - one solution would be letting player BOTH Arrow Keys and WSAD for movement at the same time (with jump being space and z, and boomerang being k and x). Or just offer remappable controls, or at least multiple control schemes. Similarly, it feels a bit awkward in level select to have to move your entire hand over to Enter just to select a level.
But I really do like that you can swim freely in every direction, it goes a long way to make the water level a lot more fun.
So far the games feel extremely easy - it's pretty hard to get hit by anyone, and you have six hits - but since these are just the early levels, I think that is just fine. The movement feels nice and that's the important part.