Fixed worldgen to only use tiles without collision in filling rooms, then a couple more changes to lighting so that if the light is <= 1 it just assumes the base light strength which ends up looking nicer and more like the kind of light I want.

assets/tiles.json

@@ -2,51 +2,61 @@
   "WALL_TILE": {
     "foreground": [230, 20, 30],
     "background": [230, 20, 120],
+    "collision": true,
     "display": "\ua5b8"
   },
   "FLOOR_TILE": {
     "foreground": [40, 15, 125],
     "background": [200, 15, 75],
+    "collision": false,
     "display":"\u289e"
   },
   "MOSAIC_TILE_1": {
     "foreground": [40, 15, 125],
     "background": [200, 29, 75],
+    "collision": false,
     "display":"\u19f0"
   },
   "MOSAIC_TILE_2": {
     "foreground": [40, 15, 125],
     "background": [200, 29, 75],
+    "collision": false,
     "display":"\u16de"
   },
   "MOSAIC_TILE_3": {
     "foreground": [40, 15, 125],
     "background": [200, 29, 75],
+    "collision": false,
     "display":"\u1378"
   },
   "BG_TILE": {
     "foreground": [230, 20, 125],
     "background": [230, 20, 125],
+    "collision": true,
     "display":"█"
   },
   "WATER_TILE": {
     "foreground": [156, 164, 238],
     "background": [200, 15, 75],
+    "collision": false,
     "display":"\u2a93"
   },
   "SAND_TILE": {
     "foreground": [24, 106, 180],
     "background": [24, 123, 100],
+    "collision": false,
     "display":"\u17f6"
   },
   "GRASS_TILE": {
     "foreground": [41, 180, 180],
     "background": [75, 100, 100],
+    "collision": false,
     "display":"\u0799"
   },
   "BROKEN_TILE": {
     "foreground": [159, 164, 15],
     "background": [199, 15, 79],
+    "collision": false,
     "display":"\u2274"
   }
 }