Love your take on blocky terrain like Minecraft, the similarity to Terraria also is visible.
Here are a few thing I think you can improve:
1) The art style is simple, but maybe a little too minimalist. Maybe try to spice it up with some better art or textures and that's gonna add an awesome punch to the game ;)
2) I think maybe come up with some background art. The grey looks a little bland right now, but if you want to develop this further, I recommend making some background art :D
That's about it. Nice and loved every moment of playing it. ;)