For a game jam entry, the presentation has a lot of polish. It's common to not have time to add the effects that make player controls feel great, so beeps and stretches in the main menu make this project stand out.
I appreciate having fewer colored tiles in lower difficulties. It made the game's concept much more digestible.
This is my personal preference more than anything, but I think the game would have been much more enjoyable without the time limit. I feel like the game wants you to think things through without actually giving to you the time to do that.