When it is the enemy's turn the buttons are disabled and they shrink in size. You might want to update the disabled theming to stay the same size as normal so that the buttons stay in the same place.
The bear's non-attack abilities are amusing.
After a few tries I went to the options and unchecked Tutorials. After the turtle appeared it still showed the "Battle unfolds by turns..." tutorial text, along with the one that shows up after it. The later tutorial text did not show up.
It seems like the human with a bear arm can give you a bear arm on either arm, though I fought 2 in a single play, so maybe each gives you a different arm. I thought they looked the same, but may have missed a difference. The first several times I encountered them they gave me the right arm claw, but my last playthrough the first one I ran into gave me the left arm claw. Then I faced the bear and got nothing from using the syringe on it. It would be nice if each gave you something distinct, so you don't have an overlap like that where you get nothing. Thinking on it, I'm wondering if maybe I clicked too far over and it registered as the body instead of the arm, and that had something to do with it. However, when I clicked on the turtle's head or legs I got the shell, and anywhere on the bear seemed to always give the left arm, so I wasn't really paying attention to make sure I lined things up on the body part after that. I did notice that the human gave me nothing if I clicked on the body, instead of the arm, or maybe it is chance based? Later I retried using the syringe on the bear twice and was able to get both arms. I'm not sure what the issue was the time the human gave me the left arm and the following bear gave me nothing.
It seems like the turtle is always first, then your have the 4 other enemies in random order, and finally you fight the monstrosity as a boss. After getting both bear arms using the bear hug was very powerful, and all I did until I won. I skipped getting the fangs after a few tries using it, as the poison does too little damage to really be worth the turn using it. It might be useful in your first fight against the turtle, as that takes a while, but generally the higher power attacks like swipe end the fight quicker. Also, unless the part hit by venom is replaced, I don't think there is a way to get rid of it, so I wanted to beat the enemy fast to prevent getting hit by it. I'm also not sure on the wrap ability as it doesn't give any feedback when used, unless the enemy shakes free right away. I'm guessing that it might prevent use of that body part, but it would be nice to have something clarifying that. I didn't really use the withdraw much, though without using the venom I probably should have, as I did lose a few times from head attacks, but by then I had focused on kick, swipe, bear hug.
I played through again to test things. After winning when I had used Withdraw and restarting, the button says Pop-out when I first get the shell, and pressing it gives the pop-out message, requireing 2 turns to withdraw.
I had fun playing. I liked testing out what body parts I could get from each opponent. Adding more enemies and perhaps making it so that you don't always fight every enemy in each play would add a bit more variety and need to strategize, rather than planing to go for the same abilities each time.