I'm generally not a huge platformer fan, but I really liked the minimalist feel of this. I liked the quick jump, I would have liked slightly snappier controls on launching the curse out of myself. The one thing I absolutely loved was the level design, which can be really hard to nail for the short time span!
The other thing I initially thought was when the yellow curse let me walk through walls, I thought I had to return to where I picked up the first treasure to try and walk through there. Not a big deal. It was fun, I enjoyed it, and the particularly twisty ending.