hmm.. been looking at for a while, initially i didn't care for it, but on second thought I think i like the idea. Still kinda ambivalent about it though, since ii don't like is the fact that it adds a lot of colors to bg. that imo looks "busy" enough as it is. Water tiles are a bitch, but i think you did a good job. I minor crit - i think there's too big a difference in alphavalues, some parts you can barely see through while others are fairly opaque. I suggest you bring em a bit closer together, dunno, mayby it's just me.
Anyhow, thanks for keeping this post flooded with top pixel art, it's a goldmine