I built 5 of these PCBs, using a 100uH inductor.  3/5 PCBs flickered.  I found that the uProcessor was being reset intermittently due to the fast transients in the boost converter.  The cross talk made it to the uProc's power supply line and caused it to reset.  I fixed it by adding a bypass capacitor on the backside of the programmer pin head array.  I also turned down the H-Bridge frequency to reduce the power loss.  It now works with no flickering and no hot devices.  I have had on a moon in my sons room for a month now with no issues.