Hey! Glad you enjoyed your playthrough.
Regarding performance / loadtime, I'm sorry to say that this game is essentially totally unoptimized. So I'm guessing that's why your browser froze when trying to play. Apologies for that. There is a Windows build available on the repo, which perhaps may have better performance. I do have some small post-jam patches planned, but any performance improvements will likely take a while for me to hammer out.
Regarding the mouse lock, not sure on that one. Itch will generally release the mouse if you hit the escape key, or the Windows button. I could just be misunderstanding the issue though.
I generally try to review anyone who's taken the time to comment on my game, so I'll definitely do that right now.