This is a really cool idea for a puzzle game! If you work on the game after the jam, it might be nice to have a few more easy early levels to help the player understand how the game works. I would love to see how this looks after some polish and playtesting, but I think you did a great job showing the potential of the core concept!

Fantastic idea for a game! I thought you had some really cool ideas going and definitely one of the unique projects I've seen for built to scale. Love it.

The aesthetic is gorgeous, and I really like the idea! This could be a really fun game fleshed out. The only thing is that like others have said - the player movement needs a bit of work. It feels too slippery and not as responsive as I would've liked, but if you adjust it so it feels really satisfying this idea could be really fun!

This is a really cool mechanic. The movement was very slippery and so it was sometimes hard to judge jumps, plus the music didn't always seem to play when pressing P but other than that the game was very polished. The aesthetic is great and the puzzles were never too challenging to become frustrating. 
Well done for getting this completed as your first project you made a great game. 
(edit: spelling)

I enjoyed the light-infused colors! Well made.

Movement is too slippery, but these puzzles are clever! Very cool sound design indeed

Combining music with a puzzle platformer is very creative. The art style looks great too. The character is a bit slippery, as you mentioned, but overall, it's a good game.

Great look, love the bloom and the general feel. The character as you mentioned was a bit hard to control, but the application of music always tickles the right part of my brain. Thanks :D

Love the visual style but I am awful at differentiating notes so this is incredibly difficult for me! Also the character is very floaty in movement and you can overshoot easily.

Fantastic work! I'm glad to see creative things like this in the jam!

Fun concept, I like the visual style too

Interesting game. controls could use some work but a fine game especially for being your first and there were a few times I was the correct size and but I wasn't allowed to interact with the exit because I guess it is looking for a specific sequence of notes

Very interesting take on the theme! Admittedly I'm a bit confuse by the changing of other notes after collecting some of them. I think mousing over the pitch will provide hints as to what the notes would change into? But I'm tone death xD

A truly original game! Interesting idea to interpret the jam theme in a musical key.

The only suggestion would be to make the character's movements less 'slippery'. But it's quite understandable that you couldn't think of everything in such a short time. Really good work!

Love the style here! Really beautiful and smooth.

I don’t have the ear to really appreciate the full effect of this game, but I love the chill vibe it has. Knowing that there’s a specific melody to beat a level, maybe have a hint note if you built the wrong melody but got to the door. Like a bubble over Note <X> that shows it should be C#?