I thought the gameplay was very good for a game jam - I wouldn't play it for hours on end, but for a short experience, it was nice. The teleportation, while not that useful in my playthrough, did come in handy a few times, and I liked that as you used your slow field, it would degenerate. The main issue I had with the games music was the music on the final 2 levels, which was a bit too in-your-face for me; otherwise, the music choice was good for a game jam. Maybe it would have been better if the music didn't restart with the level, but I'm assuming that was an implementation detail with the restarting.