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.

tilemap.cpp

@@ -57,8 +57,18 @@ const TileCell &TileMap::at(size_t x, size_t y) {
   return $display[y][x];
 }
 
-std::vector<std::string> TileMap::tile_names() {
-  return $config.keys();
+std::vector<std::string> TileMap::tile_names(bool collision) {
+  const auto &json = $config.json();
+  std::vector<std::string> keys;
+
+  for(const auto& el : json.items()) {
+    const auto &val = el.value();
+    if(val["collision"] == collision) {
+      keys.push_back(el.key());
+    }
+  }
+
+  return keys;
 }
 
 bool TileMap::INVARIANT() {