Bought this a couple of days ago and have been babysitting it, noticed two instances where bot freezes:
1. After clearing rockfall, character will not continue to move and just stand still. Rockfall will again block, character immediately clears it but stays standing still.
2. Sometimes bot stands still until I move it a couple of steps, then it catches back on. This happens more often on the outside of the motherlode area (mostly the corners) and when walking back to deposit the pay dirt.
I think this is a very decent script with the possibility to be outstanding if those two issues are fixed. Please note I have not tried this upstairs at all.