- [NEW] mbtnp() added

data/game.lua

@@ -22,7 +22,7 @@ function normal_update()
         quit()
     end
 
-    if btnp(KEY_F2) then
+    if btnp(KEY_F2) or mbtnp(1) then
         local val = zoom() + 2
         if val >= 10 then val = 2 end
         zoom(val)