Various addresses for boss HP, player positions (not sure which one is the "true" position), player 1 speed and subpixel speed, and player 1 and 2 weapon strength.
0
23
00000 00FFBF60 w s 0 Boss HP 1
00001 00FFBFEE w s 0 Boss HP 2
00002 00FFC55A w s 0 Boss HP 3
00003 00FFED8E w s 0 Boss HP 4
00004 00FFA39A w u 0 P1 X 1
00005 00FFAD92 w u 0 P1 X 2
00006 00FFF67E w u 0 P1 X 2
00007 00FFBE86 w u 0 Boss 2 HP 1
00008 00FFB184 w u 0 Boss 3 HP 1
00009 00FFBB28 w u 0 Boss 3 HP 2
0000A 00FFED8E w u 0 Boss 3 HP 3
0000B 00FFA376 w u 0 P2 X 1
0000C 00FFADEC w u 0 P2 X 2
0000D 00FFF6BE w u 0 P2 X 3
0000E 00FFA39C w s 0 P1 Y 1
0000F 00FFAD96 w s 0 P1 Y 2
00010 00FFB14B b s 0 P1 X speed 1
00011 00FFB16B b s 0 P1 X speed 2
00012 00FFB14C b u 0 P1 X speed sub 1
00013 00FFB14F b s 0 P1 Y speed 1
00014 00FFB150 b u 0 P1 Y speed sub 1
00015 00FFF63D b u 0 P1 weapon strength 1
00016 00FFF67B b u 0 P1 weapon strength 2