Really solid! I think you did a great job designing such diverse levels with so few mechanics. Having to restart after each death might have felt a little frustrating, but I liked the idea as it really increased the tension in the later levels and made those last few jumps really scary. Perhaps if the blood timer persisted through the levels it would give more meaning to replaying the first few, as improving your time would help you out later on, giving players a reason to try and improve at them.
Gran trabajo :)