Where is the heart and last gem in level 5 of Cursed Gem?

In Steam, there is a platforming game called Cursed Gem, where there are ten levels, each of which has 100 gems and a heart. On level 5, I have gotten 99 gems, but I have not found the heart and last gem. I played through the level many times, and I have yet to even see the heart and last gem. If anyone can help me, perhaps by referring me to a walkthrough or video guide, I would be extremely grateful.