Great game, with awesome implementation of the theme! However, sometimes timing right makes it really hard. For example, on the first crucifix level if you press shift too soon you instantly revive (from the light maybe?) but you lose your stack too. Or when you need to jump down and change into ghost, if you press shift too early, while touching a bit of the light you will not change into ghost, which can be a little frustrating. Apart from this, I really liked your idea, great mechanics, great game, congratulations! :)