Adorable cat. Love it.
Though confusing at first, the combining elements and unlocking spells was really fun to play around with and try to strategize which directions to go with it. One thing I'm not sure anyone else has mentioned yet is that on my first playthrough I was very confused why the spells I was combining weren't benefiting me in any way. I was like, "I combined these elements to make those elements, but nothing has changed when normal gameplay is resumed?"
Another bit of feedback is that I felt it was hard to tell what parts of the environment were ones I could walk through and which were obstacles. Maybe obstacles could be a tad lighter in color or something similar? Something subtle that can be used by players to make deciding their path easier.
Lastly, I found legibility of text on screen to sometimes be a bit poor. The worst offender is that the 8 and 0 look so similar I can't tell them apart most of the time.
Overall, really fun and cute game! Good luck in the jam and in your future endeavors.