Literally the only way you can beat them is to either use a Molotov and then turn around and let them run into it or let them hit you at least once and then pump an entire clip of bullets into them.
The first one is that on Level 2.5 the tree monsters feel like total bullshit, they have a ton of health, are about as fast as the dog-like monster, the first portion of their grab is impossible to escape meaning you're guaranteed to take quite a bit of damage if you get caught naked and to top it all off they're invincible unless they're moving or have already started attacking you.
This has to be one of my favorite h-games, the animations and CGs are generally good, the gameplay is great if maybe a bit too hard (normal difficulty feels a lot like Hard on the RE2 Remake) and it has a very interesting premise. Played a bit of the original quite a few years ago, and now that I'm better at games in general and 2.00 is out I've played through quite a bit of this new version and am loving it.
