Congrats, I played the prototype twice and worked perfectly. The mechanics are perfect for make a puzzle game, so the gameplay is nice ^^.
Keep working. Jams are made for learn quick a lot of things hehe.
Viewing post in Constraints jam comments
Hehehe, you are right. I recommend you the 3-days (at weekends) jams or maybe 1+ week jams. I´m making games for fun and for improve my skills in GDevelop, because I don´t have coding knowledge (and no time for studying hehe).
With this prototype, maybe you can expand it and make a couple of levels with more mechanics and intelligent puzzles (this involves a lot of work in level design). If you make it, I will play it ^^