A simple but very well-executed idea. I love the chromatic aberration and distortion in death form. It looks great! The level designs are pretty interesting.
To make this game even better, I think you can further distinguish between the ghost and alive form. Other than some blockades that only the alive form can move through, I feel like the death form is just superior. Would've loved to see some abilities and more complex puzzles, but time is limited, so I think you have got a great foundation to build off of! The control also feels too slippery and imprecise for my taste.
Overall, a small but very well-made game, where the effort you put in is clearly shown. Good job!