-- Try not to mix generations / styles of tiles. They stick out like a sore thumb and make your game look less impressive.
-- If you're going to take screenshots, save them as .PNG so that they are saved in their original quality.
-- Some of your lighting effects are incredibly excessive. Adding more and more lighting effects does not make your game more impressive & can be quite annoying. Also, in one of your screenshots your character appears to have 2 shadows?
Apart from those points, it's a good start and you've managed to do an impressive amount of work without any help. Well done!