An interesting premise. Not just the average isekai. The world building feels like it is well done, and the characters feel like real people, and not cardboard cutouts only existing for background noise.
The grammar and style of writing is good, which mean there is pretty-much nothing wrong with the novel.
It even has a sense of... anticipation, excitment and dread on how the mc will survive, which is also a plus.
Keep up the good work author!