debug marker in center of screen. tweak sprite positions.

src/game.c

                     break;
 
                 case ROT_45:
-                    ret = obj_add(SPR_SHOT, SHIP_OFF / 2, -SHIP_OFF / 2, spd_x + SHOT_SPEED, spd_y - SHOT_SPEED);
+                    ret = obj_add(SPR_SHOT, SHIP_OFF / 2 + 3, -SHIP_OFF / 2 - 2, spd_x + SHOT_SPEED, spd_y - SHOT_SPEED);
                     break;
 
                 case ROT_90:
                     break;
 
                 case ROT_135:
-                    ret = obj_add(SPR_SHOT, SHIP_OFF / 2, SHIP_OFF / 2, spd_x + SHOT_SPEED, spd_y + SHOT_SPEED);
+                    ret = obj_add(SPR_SHOT, SHIP_OFF / 2 + 3, SHIP_OFF / 2 + 2, spd_x + SHOT_SPEED, spd_y + SHOT_SPEED);
                     break;
 
                 case ROT_180:
                     break;
 
                 case ROT_225:
-                    ret = obj_add(SPR_SHOT, -SHIP_OFF / 2, SHIP_OFF / 2, spd_x - SHOT_SPEED, spd_y + SHOT_SPEED);
+                    ret = obj_add(SPR_SHOT, -SHIP_OFF / 2 - 3, SHIP_OFF / 2 + 2, spd_x - SHOT_SPEED, spd_y + SHOT_SPEED);
                     break;
 
                 case ROT_270:
                     break;
 
                 case ROT_315:
-                    ret = obj_add(SPR_SHOT, -SHIP_OFF / 2, -SHIP_OFF / 2, spd_x - SHOT_SPEED, spd_y - SHOT_SPEED);
+                    ret = obj_add(SPR_SHOT, -SHIP_OFF / 2 - 3, -SHIP_OFF / 2 - 2, spd_x - SHOT_SPEED, spd_y - SHOT_SPEED);
                     break;
 
                 default:
 
         uint8_t hiwater = SPR_NUM_START;
 
+#ifdef DEBUG
+        spr_draw(SPR_DEBUG, FLIP_NONE, 0, 0, 0, &hiwater);
+#endif
+
         if (redraw) {
             spr_ship(rot, acc & (ACC_X | ACC_Y), &hiwater);
             ship_hiwater = hiwater;

src/sprite_data.c

 #include "bar_spr8.h"
 #include "expl_spr16.h"
 #include "pause.h"
+#include "debug_marker.h"
 
 BANKREF(power_palettes)
 
         .off = TILE_NUM_START,
         .bank = BANK(pause),
     },
+    { // SPR_DEBUG
+        .ms = debug_marker_metasprites,
+        .ms_n = ARR_LEN(debug_marker_metasprites),
+        .ti = debug_marker_tiles,
+        .pa = debug_marker_palettes,
+        .pa_n = debug_marker_PALETTE_COUNT,
+        .pa_i = OAMF_CGB_PAL7 | PALETTE_DYNAMIC_LOAD_IP,
+        .cnt = debug_marker_TILE_COUNT,
+        .off = TILE_NUM_START,
+        .bank = BANK(debug_marker),
+    },
 };

src/sprites.c

             break;
 
         case ROT_180:
-            spr_draw(SPR_SHIP, FLIP_Y, -1, -4, moving ? 1 : 0, hiwater);
+            spr_draw(SPR_SHIP, FLIP_Y, 0, -4, moving ? 1 : 0, hiwater);
             break;
 
         case ROT_225:
             break;
 
         case ROT_270:
-            spr_draw(SPR_SHIP, FLIP_X, 4, -1, moving ? 5 : 4, hiwater);
+            spr_draw(SPR_SHIP, FLIP_X, 4, 0, moving ? 5 : 4, hiwater);
             break;
 
         case ROT_315:

src/sprites.h

     SPR_POWER,
     SPR_EXPL,
     SPR_PAUSE,
+    SPR_DEBUG,
 
     SPRITE_COUNT
 };