Interesting puzzle game! I did like the mechanics, however I think maybe 15 levels are a bit too much for game jams? -that's me personally though. It was a good game even though I didn't play more than 5 levels.
The only thing I'm afraid of is if I missed out on mechanics due to there being so many levels. I will be honest and say, the mechanics were well made, but I can only play so many puzzle levels for a day (not my favourite type genre)