Cool game! Definitely greater than the sum of its parts. The goal of the game was immediately clear, and the way you implemented the will meter elevated the experience a lot for me. I particularly like the occasional lightning strikes that add some unexpected time pressure, and I also like that the meter keeps depleting during transitions. I found myself frantically tapping my foot and thinking, "can't you go any faster?!?" The eerie sound design also contributed to the stress, and I'd say it was the stand-out feature. If you'd had more time, I imagine that you'd develop the art style a bit more, but I still enjoyed the look of your game. It made me think of drawings on a chalk board.
All in all, you nailed the atmosphere, and the gameplay was appropriately frantic despite its simplicity. Great work!