Here is my second speedrun yet, now with the game Timeshift. First of all I want to thank Zato for his great support and his advice.The game has not many possible shortcuts because most ways are blocked by huge player clip walls. I will explain some things which are not self-explanatory:

In level 5 I shoot down the palette and you time reverse so it goes up again and I can jump over the fence, which skips a trigger so most enemies dont spawn. I also prefer time-slow instead of stop in most time puzzles because you can move faster with time-slow. I have to kill all the soldiers after the duct or else the gate would not open.

In level 6 I shoot down a barrel so it pushes me up when I use time reverse, I use that trick also on some more levels. I had to shoot most of the enemies because it would be impossible to survive if I would just push myself up, there would be too many enemies and I would have no time powers left. When I reach the balcony I had to go back to the door to trigger the enemies which open the next door.

I also had to kill all enemies at the end of level 7 before I could proceed.

In level 9 I climb up the train so I could jump over the clip walls of the street. At the end I crashed a little bit :< Can be improved.

You can skip some of the cutscenes, but to the end you often cannot.

In level 19 I can jump myself into that wall but it is difficult because there are clip walls on the sides. Later I use a barrel to boost myself up to the left side of the hall, I have to jump that high because the clip walls are very high too.

Level 20: When I jump over the pipes I skip all the triggers for the helicopter part and everything, and when I go back and touch a specific trigger the doors to the exit open.