Hey thanks for your feedback! :)
The music was made by Octonyte: https://soundcloud.com/octonyte
Haha I don't know which music you are referring too but I'm glad you liked it! ^^
The level design part was done in a hurry the last 2 days and we had to make it possible to finish the game without being stuck (we even had some parts of the map where you could go outside of the world) but since we didn't have time to make some people playtest it.
That's why we decided to make the map "big enough" so that the game isn't finished too fast and it leads to the problem you just described.
The maze is quite an ironic thing because we decided to make it small so that the player doesn't get borred.
About the UI it's mostly label and buttons using the font referenced in the credits.
You are probably right when you say I don't need to list Godot's contributors, however I felt I wanted to do it because I'm grateful about this engine which I really love and people don't necessarily the credits. (so thanks for that! ^^)
EDIT: Oh yes if you talk about the page on the submissions I thought it wouldn't be displayed and the normal Itch page of the game would appear! :S
What do you mean by build? Is it the fact it for several platforms?