FULL MARKS!!!
I loved it. The art is great, the story is pretty interesting and the gameplay mechanics are wonderful!
Only caveat I have is... it was quite obtuse. I didn't wait for the portal to open the first time and I would have never found the key in the cutscene. Getting the second wrench may have been a better first task to get the player familiar with the gameplay. (also, a little too dark to see at times)
Still, I loved it and the music really made it feel urgent!
Really great work, the atmosphere was AMAZING!!
PS: The pop-up wasn't full sized at first so I thought I was supposed to move it around to "reveal" secrets, then I saw that I had to maximize it to enter the timeline.