It was a tower defense/shooter kinda like steampunk tower (but just one side of it). You had all your turrets along the left side of the screen and enemies flew in from the right. I think the title had the word "Sky" in it and there were 3 or 4 of them in the series if I remember correctly. Everything was very stylized and a little steampunk-ish. I used to play it all the time a few years ago, but it doesn't look like it's on this site anymore
