An interesting game that I feel definitely could have been worked on much more to make a full-fledged experience.
Gameplay is high-tension and fun, even though it took me a while before I realized what to do (collect enough clock items and then activate the console to jump into the time machine). However, I feel like its weakest point is just how weak the knives are. They're so weak it's simply not worth it to attack enemies before they kill you, each enemy takes around 6-8 hits to kill which is a lot. I highly suggest making the knives push enemies back, or having upgrades that can boost the power of your shots as you go through the game. The music is really damn intense, I give you that. It fits the gameplay loop well.
If you do make this a full game, do consider my suggestions above as well as add more areas for uniqueness and continued fun. Overall good work! My high score was 9000, by the way.