This is a really solid gameplay idea, and implemented very successfully with a very coherent aesthetic; the tonal shift between the past and the present in your use of colour palettes is particularly pleasing, and I would like to commend you on your music - it is just long and varied enough that it loops pleasantly without getting annoying.
It errs a little bit on the side of 'too difficult' in terms of memorising the differences between timezone; this could be because as the level designer you know where everything is and were worried it would be 'too easy', but with fresh eyes it becomes a memorisation effort - you might want to consider some subtle guidance here, for example having background elements that suggest where things might be in the alternate zone, rather than as /purely/ graphical elements, or maybe some 'lead' on your camera, so that it is not centred on where the player currently is, but on where they are going to go, to make it easier to 'plan' where you are headed before committing to it and then trial and erroring through the changes.
Overall this is an incredibly strong vertical slice, and if it had been a real GameJam entry would end up scoring very highly! As an aside, I would personally downgrade the 'you can get stuck in buildings by timejumping' bug reports from an A to a B class, as you can 'fix' it by timejumping; if you had been stuck permanently and had to reload it would be an A.