I've now posted a new video: Let's Play: Solo! Session 09 interlude, below the graves.
That was unexpected, surprise is just so devastating at low level. :( I feel it was just mostly bad luck. My experience running 5E first level is there is usually one encounter where a character, or sometimes the party are really at risk of dying.
Overall as mentioned in the video I feel the tables are conservative on monsters appearing. I'll run one more playtest and then unless I change my mind - boost the CR 1/8s to 1d3+2 for 4 PCs and leave the 1/4s the same, the stirges stay the same, and the swords the stay the same too.

