Well, I am really new to game development. So couldn't focus much to make it perfect. Mouse target just helps you to climb upwards and if you use left or right keys then you can probably add some force up(by leaving the mouse click).
The thing related to rewind is: If you die with the enemy, your level will be restarted, if you die by falling down from the platform or to the ground, then your previous level will be loaded. Ofcourse previous loaded level is disabled in tutorial and first level