Also, maybe some more animated tiles? It's kinda weird to see animated grass sitting right next to a Muncher Plant that just stares with its mouth open and kills you. Not everything, though, maybe just things that would look weird without animation (like Munchers, propellers, wheels, etc.).
Edit: And maybe for some of the other waterfalls (like maybe one of the lighter ones) and lava (upside-down lava and such).