The first idea can be really fun honestly but it could become repetitive fast however the second idea is crazy cool and unique, the going back in time concept cool, only there will be 1 issue that making it would be kinda too difficult cause there could be 100 possibilities but we make it simple like those novel games where you had to make 1 choice or another idea: you had to go back in time and find and kill the correct enemy, if you fail 3 times you die yourself the universe is ruined☠️☠️