Well, the cave looks average, but that route and the city look cool. Maybe you should put something else in the cave, too; not just rocks and water paths, cause it seems a bit... boring. I have no idea what you should add to it, though. Maybe change a bit on the shading and it'll look a lot better.
I don't really know what to say about your game right know, cause you're quite at the beginning of it, but don't give up and good luck!
Btw, nice sprites, RocketMeowth; even though they're fusion, they still look very cool. I think that the fire starter is a bit odd... it looks, too big for a basic pokemon. Though if you'd make it's tail shorter, then it would be quite great. Well, good luck to you, too!