Thank you for this very elaborated feedback!
I have learnt a lot from different places on how to make sure the player knows exactly what to do withought having to tell them what to do since the player can clearly figure it out themselves. Very very useful bit of knowledge that I have learnt to use in my games.
Some people have said that the rewind is a little slow, so if I were to complete this game (who knows, maybe I would have the time to do so, but with the possibility of Uni and all sorts of other things happening, it might seem unlikely), then I would definitely take this option into consideration.
This kind of problem is something I did not forsee. That is a very much valid solution to this problem, thank you for this suggestion.
The lava sending you backwards in time can be counteracted by manually rewinding and stopping the rewind, which I agree myself, a badly designed feature. Since I didn't think it would cause that much of a problem I just kept it as it is, but giving the player the option to rewind back to the point where the person was alive is very neat indeed. Thank you very much for that!
Thank you very much for the feedback once again :)