Interesting idea but perhaps could have done with a focus on the simply getting to the end as I felt it was challenging enough without the timer. I managed to get to the second layer of blocks and carried a small one with me but when I switched worlds and fell to the ground I wasn't able to get back up because the block was stuck somewhere I couldn't now reach.

Perhaps just having one block you can move but that will also transition with you between worlds could give a bit of focus to how the player gets through the level. There's emphasis on memorising where the platforms are in the opposing world so this might give it some structure.

Good atmosphere and nice music in the presentation though.

Very cool idea, the execution is a bit rough around the edges, but that's to be expected. My old laptop struggled with it a bit. It was surprisingly difficult from the get go. You might want to add some platforms where I can safely switch between worlds without falling off early on while I'm still learning the ropes, so I don't have to memorize the placement of everything and can focus on acclimatizing myself with both the controls and the concept. (Granted, I didn't go very far, so it could be that you have these spots later in the level.)

I really liked the music, although it was a bit at odds with the visuals. UI, GFX could use a bit more work, but it's very solid overall, well done!

This game was really unsettling!! Loved the creepy atmosphere, very cool concept!