I've watched your entire video and left you comments separately there!
Right mouse button now orbits the camera freely in v0.8, so it cannot be used to cancel unfortunately, but ESC does all cancellations.
A tutorial now locks all tabs in v0.9, preventing stuck in tutorial.
Build button fixed.
Middle mouse click isn't used in the game, though will see if there's a way to disable it on Unity WebGL.
Yes, I love frostpunk! Haha. Maybe this is frostpunk but with tower defense and bombs.
I like your suggestion of reducing buildings available at the start, I think the v0.9 update will solve this.
I will continue to provide updates every few days. Thank you so much once again!
Also I was a little crazy and pulled the trigger to put the game on Steam: https://store.steampowered.com/app/3558060/Last_Fuse/