Thanks for checking it out!
I will take note of the issues you've found and address them as soon as I start development again. As for the interest system, I failed to mention your monsters' "attack" and "defend" abilities also affect the meter. So if you used "attack" but your monster used "defend" they would cancel each other and not change the meter. I will make sure to explain this or change those mechanics in the future.
Your feedback will be very helpful, so thank you for that. I hope I can improve Monster and make a more polished experience. :)