Well, I'm sad to say I couldn't get very interested in this. I think the main reason it didn't appeal to me was how the graphics weren't impressive at all. It looks a lot like this was something you made a long time ago and just submitted to the portal. I'm used to more recent works. You've already made four demonic defences, I'm not asking for another. I recognize your voice from your videos.
I think it should be that the tiles disappear when you get something right. Other than that, it just seems like an endless game. I appreciate you trying to teach us math, but it isn't very enjoyable. I don't even know what that green thing is. You need to omit the red outlines from the squirrel.