I played this for a while and loved so much about it! The parallax scrolling in the background is a gorgeous detail and you nailed the theme really well with the Leonardo Da Vinci Tank machine. There's something funny about renaissance level technology fighting eldrich abominations. I think with some more polish this could make for an excellent tower defence game. Only nitpicks I would have is the button to upgrade the main base didn't really stand out and I didn't take notice of it for a while and it wasn't exactly clear what I was going to be upgrading initially when I clicked it. All in all excellent work!