Very well made
Maybe a blood paintbrush? I don't think you really made enough bloodsplatters, we need more blood.
Heres a suggestion for an easier interface... you could have a scrollable box to subdevide weapons from heads and bodies. Then you could fit a lot more of them instead of them taking up so much room.
More rooms, more hats, just more stuff.
Maybe a color changer with R/B/G sliders?
Music on/off maybe 2-3 tracks.
I love the rotate feature, good job on that. Looking forward to MSC4