To start off, I really like the pixel work done here. The different character and potion designs, and the animations too! The parallax effect also adds a lot of depth to the scenery and makes it much more dynamic.
I also liked the recipe book and the names of the different potions, it's funny. The character controls really well and I liked the fact that the player has some level of control on how high they can jump.
A couple of things I noticed on the levels:
On stage 2, you can actually go on the top of the cliff in the right side, but there's no way to get back up. I can only go out of bounds. I thought you had hidden one of the ingredients inside of the cliff, since there's a tiny corridor there.
I like how the banana in the 2nd stage was designed so that you could fetch it and fall directly onto the cauldron. It was smart level design.
I wish in the 4th stage there was an indication of the character taking damage by staying too long in the poisoned water. I walked in it a lot because I thought it didn't do anything.
Speaking of poisoned water, the one below the pig seems to have some odd collision detection, as sometimes, under the platforms, the character couldn't walk through, so I would jump over the odd collision.
I'm not sure if this is intentional, but if I press the jump button really fast, the character does a semi double jump. It's not game breaking or anything, just thought maybe you'd wanna know.
This game is really nice though. The music is really good, very pleasant to listen to and fits the vibe of each level, and another thing I liked was the tutorial, which made things very clear from the start. There weren't any game breaking glitches and, as stated earlier, the character controls well and is fun to play.
This is a pretty good game. I liked playing it!