Hey this is really cool! From the top, I love that the main menu is not only interactive but that you need to use the character to select the options. I haven't seen those together anywhere else in the jam (mine is interactive but uses normal buttons lol).
Like @mamu has noted below, the use of a background grid is a really good choice for giving a stable reference frame, I often found myself counting tiles to keep track of where to be going.
I couldn't really get a hang of the purple crystals and I'm really glad you added a skip for the few I couldn't get the jumps on.
I think the main note I have is to give a more clear visual difference in the memorise and play states - perhaps change the background colors or a countdown bar to make that more clear, since its pretty normal for players to tunnel-vision when first playing.
Great stuff!