Hey, here are my thoughts:
- Congrats on making a math game. It is definitely not a popular subject for games. Although it found it more a math quiz instead of a game. I did not find the game aspect..
- Maybe let the player click his mouse to start the game when you only use the mouse afterwards anyway.
- I was a bit confused why the keyboard changed place when doing the second part of a level. It felt like a new level but it wasn't. Maybe you could just change the color of the first digit to green when entering the right number.
- Also did not quite know why how the theme was implemented into the game. You need to solve math to be able to get the time rewinder, but maybe you could do something else with it.
Dont get me wrong, I give a lot of qritique, but I read that it was your first game jam so you still have a lot of chances to improve!
Certainly not bad for your first game jam!