Really cool game! I've played a couple puzzle games before that involve using your past selves, but this was a nice interpretation of it. The art is super cute and the sounds too, I like how the bear looks and sounds when you jump. It's super intuitive and simple, but still makes you think (that last level stumped me for a bit when thinking about how to collect every star)
I think the only improvements would be with how the game could do with more levels, and a way to return to the menu perhaps with a level select option? Also little minor things like the bears not appearing on the same y level when on a platform that moves up.
I also just wanna say that the logo is really well drawn, and I absolutely love the soundtrack, it's incredible. (the final ost may have been a bit loud though)