The idea is great, and good job for finishing it within the given time! I've had a lot of fun experimenting with the different shapes to find strategies, but I felt some of this game was a bit rushed. (I guess that happens in Jams :P)
For example, you could easily clip out of bounds by swaping with other shapes close to walls. Otherwise, most of it was very well made to showcase the various possibilities which emerged from the core mechanic!
Well done! :7