Wow! I really, really enjoyed your game! The look and feel of it is so nice - great job with the sprites, too! I can tell that you put a lot of work and effort into your game, the quality of it really shows! I especially loved the dialogue, it's super cute and very funny! I also very much enjoyed the mechanic of being able to switch between the light and dark dimensions even while in mid-air, plus the other fun things we can do in each dimension! The only slight issue that I encountered is that I found it very difficult to have to move, run, jump, switch dimensions, and sometimes reset all with the same hand, but maybe that's just me, hehe~ Regardless, it was a very fun and very enjoyable game you made, and I'm really glad I got to play it!
As a side note, congratulations on your first game jam submission! I really hope you enjoyed the experience! ^^