I finally finished my game, and with that able to finish yours!
I would have liked to see a chart of some kind where I could see each animals values, I found myself clicking every animal trying to find the number I was looking for, though for how fast you made this game it's understandable.
Also on level 15 I got very confused because there were no brackets around the first 3 cages for the pemdas (maybe the same with level 20? They are a mystery but I used a lot of 1's so I didn't have to worry about it)
Otherwise it was a good game! I enjoyed playing it