Could you please upload a version that hasn't been blurred? It's not possible to critique pixel art if it's been blurred, since the pixels matter in pixel art.

Or, if this is how you drew it and there is no "unblurred" version, then reconsider the tools you're using, as they're creating a lot of unwanted, uncontrolled colours. Pixel art is about control, and that means that any pixels and colours added to the piece should serve a purpose. Use tools that give you pixel precision and don't have automatic anti-aliasing.

Weird, imgur never blurs your images unless you edit them in imgur.... Nice to see the crispy pixels (they are not blurred at all actually, double checked. It would still be nice to have the 1x version, it's nicer to see, we can zoom in and out ourselves (the forum has a zoom function) and potentially make edits on it..

Also, since you mentioned they are tiles, you might want to show an example with a larger field, tile-ability and pattern forming through repetition are important things to watch when you're making tiles!