Wow this is great! Nostalgia factor is through the roof! I see lots of Kirby, Sonic, Yoshi's Island, Mario RPG and Paper Mario influences in this. Your graphics are adorable and your enemy designs are incredible. I'm still on level 2-1, and I'm putting it down for the time being and will finish it up later.
I love the difficulty you have so far. I'm dying just enough so that I feel like it's hard, and not so much that I feel frustrated. So far you seem to have the perfect balance.
One thing that I felt was off, I kept accidentally walking too far when I was trying to jump off a ledge, I don't know if that's just me overestimating how far I can walk before I fall off though.
Looking forward to more!
EDIT:
So I beat the last 2 levels and I have a few things to say.
With the watermill part on 2-1, occasionally I would not land on the platform and instead just plummet through to my death (or just being hurt). Not to mention that part of the level is incredibly unforgiving.
The next level reminded me a lot of the super nintendo Aladdin, at the genie world
but it had some bugs. Occasionally the wind guys would fade in and then just disappear for a ittle while, and then just pop back in shooting at you I think this happened when you are on top of them while theyre fading in, but I'm not sure. The moving blocks were very picky about crushing me. One block would hurt you while it's opening up, which it's not supposed to. If you are standing just a pixel under the blocks it will crush you, I think if there is a significant amount of space it should push you as in super mario world. And with the boss, it is hard to see his shots against the back ground.
Other than a few punishing jumps, the last 2 levels are very well designed! They look amazing! As with the walking off a cliff thing, I fell off ladders a couple times because I thought I would be able to climb down a little further. Something to keep in mind.
With the level 2 fire spell, I could see its description when I hadn't unlocked it yet. And when I had unlocked it I still couldn't use it.
Keep up the good work! I'll post again when I find all the secrets!