Thanks - that's the most useful report we've had, and the phone pass especially.
On the 404: it was /favicon.ico and it's gone. I just reloaded the live build with the network log open: zero requests at 400 or above. Nothing was ever missing from the game itself.
On level 2 being tight: you're right and it's being widened for the next build - the acceptance window on the first shot roughly half again as wide, and a little more on the second. The aiming arc is getting thicker too, because on a phone your own thumb covers the thin one.
And I played Wickline and left you notes on its page - including the one thing I'd change. Turns out we both built a game about setting things on fire this jam.