@twowolf I'm glad you enjoyed our game, and good job collecting all the golden stamps! As grizeldi said, we didn't make the music and SFX ourselves, that's why we opted out of that category. I found the music on pixabay, and I thought it fit with the game pretty well :)
As for the puzzle design, I had [GMTK's](https://www.youtube.com/@GMTK) recent series about making a puzzle game in the back of my mind when I was starting out.
I started out by listing all the different mechanics we thought we might put in the game. Then I made the introduction level to figure out how im going to be drawing out the levels in google sheets. I then proceeded to try designing a tutorial level for each of the mechanics, but later I decided to change the movement speeds so I scrapped all of them and started from scratch again haha. Introductory level, tutorial level and two additional (slightly harder) levels for each mechanic. For each one I had a bit of an idea of what I want the player to do or learn. First just how to move the car, what the goal is, expanding on that a bit with some harder levels, and then introducing a new mechanic in another easy level that makes use of it. Sometimes I wanted the player to do the wrong thing first, and then try again to find a better way to finish the level. I was trying to not overwhelm the player by introducing a lot of things at once, but I could still do a better job at explaining the basics. For example I didn't mention/make it obvious that vehicles can pass by each other, but can't stop on the same tile.
All in all I feel like the progression is okay, but a few harder levels are missing. It's too easy to collect the golden stamps, except for a couple levels. But we were running out of time, so we focused on other things. And I don't think I was mentally capable of designing more levels the last evening of the jam haha.
Did you maybe find that the levels progressed to slowly or were too easy? After designing them it was hard to tell what the difficulty really was :P
If you have any more specific questions I'll answer them when I find time.