Sure, such a feedback is in the end even more helpful, than a simple "great game" :-D
Totally agree in nearly all points (except the ending :-P). I wished there would have been a few more days to fine-tune everything, because i also personally noticed it on my latest playtest, and seems the "slowlyness" is really the main critic point. Definitely have to try to avoid such parts in future already by design...
The danger sign is a great idea.
Thank you, especially that you then even played it to the end in your "frustration" :-)