The premise is okay for an isekai, but drawing quality is inferior. At the start I thought it was fan-made, not professional. The worst part is that it lacks of harmony. Some things are very detailed, the MC is very rough, the dryad is more in the soft, ... Just to say: p16: I thought it was another beast, since it wasn't looking at all like the previous page
For the story, I'll wait a bit, to see in which direction it will go.
Also: WTF with the insects. I can happen when you are in the jungle because insect are hiding everywhere, but where did they come from? Was the beast a zombie or what?