Hey there! Thanks so much for playing and giving good feedback. I also happen to love the music, which was composed by Benn Gabriner (who you should check out here if you want to keep up with his stuff: https://www.instagram.com/mirrormang/).
I'm pretty honored to see you compare TLU to two other fantastic games, thank you! I agree with your criticism of the rainbow tunnel and the low lighting - both were meant to be tweaked a bit more, but the risk of doing a game jam is always that there will be significant rough edges due to time constraints. Those areas definitely fall under the "rough edges" category.
At this time there aren't any plans to expand this game, as I'm pleased with what it is, but it means a lot that what you saw left you wanting more. Thanks again for taking the time to comment with your thoughts, it means a lot!