This is really cool, thanks for submitting! I liked it a lot, but I love math so I'm biased. This could be a really cool way to tickle the "make number go up" part of many people's brain that games like Balatro and other roguelikes trigger. I could see a longer game with upgrades you can get to improve your ability to do as much damage as possible. One thing I wasn't sure about was if I was trying to divide by/subtract the largest possible amount when defending, or if that was reducing MY damage to the enemy. I ended up going with "I'm defending against his attack so i want to divide by and subtract as much as possible", but I'm not sure whether I was correct on that!