It is dangerous to go alone. Take this:
20
00000 0000CFEC b u 0 Boss HP
00001 0000D1EC b u 0 Enemy
00002 0000CFDF b u 0 Boss invulnerability counter
00003 0000CDF0 b u 0 Charge
00004 0000D2EC b u 0 Enemy
00005 0000D2CE b u 0 Enemy position
00006 0000D2CD b u 0 Enemy sub-pixel
00007 0000C8CE b u 0 Bike-X
00008 0000C8CD b u 0 Bike-X-sub
00009 0000C8C9 b u 0 Bike-Y
0000A 0000C8C8 b u 0 Bike-Y-sub
0000B 0000C8C6 b s 0 Bike-Y-speed
0000C 0000C8CB w s 0 Bike-X-speed
0000D 0000D82B w h 0 Player HP
0000E 0000D1C9 b u 0 Enemy Bike-Y
0000F 0000D1CE b u 0 Enemy Bike-X
00010 0000CACE b u 0 Bullet X
00011 0000CFCE b u 0 Enemy Bike-X
00012 0000CAC9 b u 0 Bullet Y
00013 0000CFC9 b u 0 Enemy Bike-Y
Edit: I found an old WIP that starts the next level:
http://dehacked.2y.net/microstorage.php/info/1843812822/gbc-spawn-wip2.vbm
The whole thing may not be quite optimized, but it should be helpful to the next taser.