So it took me about three days but room 0-4-1 is okay now. The four bosses (B,C,D and E) work well in their new environment - there is still the odd chance that they will be broken in some way when you fight them for real, but that's what testing is for - and you can fight them to your heart's content. That led me to fix many small other things, such as the elemental blast skill homing on bombs and other projectiles. Now to move to other, newer things!
Time spent on the project so far: 452 hours
Currently working on: Continuing the story