Oooh I love the character pixel art soo much!
As a pixel artist myself I was immediately impressed by the character art, especially the transformations. There's a lot of love and attention there that I appreciate.
Although the game was pretty short I enjoyed it, grabbing ingredients and making double jump and spiderclimb potions was super cool. I enjoyed the mechanic of having to explore as a ghost to light the way then return with your body. Having the little skulls attack you during that form was a great choice.
I wasn't a fan of the attacking back though. Having to actually move with the keyboard to align my shots I would have preferred if it just went where my mouse was. It wasn't a huge issue as the enemies were so easy to beat but it was a little jarring at first.
The crafting system was pretty basic but it worked well, the art for all of this (and the UI in general) was also awesome.
The audio was pretty basic but it did the job. No major comments about that.
The ending was interesting and sets the stage for more. I hope we get to see more in the future.