What an incredible take on the theme. Mostly I expect the theme coming back in the form of game-play. But a sibling bond that has been broken is a very unique angle. I absolutely loved the ending, it gave me goosebumps all over my arms.
Now as for critique. The overall levels sometimes felt to "bland", they had pretty colors, but there was no general "pull" that kept me wanting to explorer this weird mystical world. I simply followed where the butterfly told me to go, but often times I was already at the "checkpoint" myself before I knew it. I would have loved to be able to get lost inside the levels and explore the dreamy landscapes (although this might simply be a time constraint issue, it is only 5 days after-all).
I would also focus a bit more on audio immersion, next to lighting audio is THE most important part in a game like this to really pull the player in. Make the player feel the difference of materials he/she is walking on or through by using different audio clips. There was wind and stuff, but use much more ambient audio! The water that softly hits the edge, the bristles of the tree rustling against each other, the sounds that might appear in a distance giving space to your environment.
Story telling wise definitely something with potential here! Would love to see more of it.
Viewing post in Through the Closet Door jam comments
Thank you for your compliments and feedback, I was planning on adding more to the environment but as you guessed, I couldn't because of time constraints, I was going to add more little audio to enhance the ambiance but it was 2:00 AM and I had finished everything else and I just wanted to sleep XD
But I'm really glad you enjoyed it and I appreciate all the feedback given!