Start again where? What counts as progress?
Sorry, I told you wrong. The published version does not have this feature yet. In the last years I have updated the game and included the revival feature. Now, if you die, you just respawn in the starting area with all collectibles retained and all killed enemies still dead. Additionally, there are shortcuts that you activate while you progress so you can easily reach certain places from the start. I'll see if I can publish the new version soon. If you want, I can send it to you directly.