What a great little puzzle game - were all the models and animations done during the jam? If so, that's quite impressive.
Only minor critique is that sometimes the dragging is a little unresponsive.
To go against some of the critiques here, I actually think it was quite refreshing not having any music and only having minimal but well executed sound effects like you have here - based on some of the ones I've rated, sometimes overdoing the audio can really detract from the experience.
Fantastic work