Hey Valeriy! Thanks so much for the kind words and helpful input. I'm happy to hear that you liked the game!
You're absolutely right about the level design feeling a bit too open initially and then more restrictive later on. We ran out of time, but would have liked to polish the level design for another day or two. I think if I was to redesign the moment-to-moment gameplay, I'd have the puzzles broken up into smaller rooms, and completing a puzzle would automatically "fast-forward" both characters to the start of the next puzzle instead of requiring the player to manually keep both characters in sync.
Thanks for letting us know about those two bugs. That will be the first thing I fix when I get a chance to work on a new version. I was hoping I had accounted for all the plant vs climb situations, but I didn't test enough to encounter that first bug you described. The second part (about not being able to teleport when you see your reflection) was something we found and discussed near the end of the jam, but I ran out of time to find an elegant solution for that one.
I love that idea about different foliage colors for each age (maybe the past could be summer and the future could be fall/winter). I ended up going with a temporary "warm" or "cold" overlay that helps each age feel somewhat distinct, but I agree that after that overlay fades, the two ages still feel much too similar.
I definitely wish there was a more impactful ending. The crystals just ended up being a somewhat mindless collect-a-thon, and it would have been fun to be able to spend them or at least get an alternate ending or a "congratulations" message.
Thanks again for taking the time to finish the entire game and provide all the great feedback. It's very much appreciated!