This feels like a solid jam prototype with a clear core mechanic.
I liked using the mouse wheel to move between the past and present, especially once the seed mechanic started coming into play. Planting different seeds to create platforms/bridges and then switching timelines to solve traversal puzzles is a fun idea, and I could definitely see it getting more interesting with a larger set of interactions.
One thing I’d work on is the visual clarity of the past. The grayscale effect communicates the timeline change really well, but some of the environment starts to blend together compared to the present. A little more contrast/value separation would probably help a lot without changing the look.
There isn’t a ton here yet, but the mechanics are there, and I’d be interested to see what kind of story/setup you build around this in a fuller version.