You can now set a sprite as a background in Background which will simplify a lot of games that just place sprites over a single image.

src/guecs/lel_parser.rl

@@ -42,7 +42,7 @@ namespace lel {
 
 %% write data;
 
-bool Parser::parse(std::string input) {
+bool Parser::parse(const std::string& input) {
   reset();
   int cs = 0;
   const char *start = nullptr;