I think the tutorial is still there, but it requires a whole magic spell to access. You see, if you leave the game small, you can click on level 4 and, I think, 5, and then you, for some reason, get a tutorial. If you full-screen it, you don't get those buttons. I have no idea how you guys managed that without intention, but it's kinda hilarious.
I remain a bit confused as to how to actually utilize the scaling power, probably because I'm not entirely sure what actually scales and in what proportion. Unfortunately, the game has quite a few frustrating bugs. For instance, shooting a missile by changing back to turrets - that's a bit of an unfortunate waste of... gears, apparently? One more day of polishing and, perhaps, another turret, and you would've had something pretty cool on your hands. But currently, it's a tad frustrating and a bit boring to play, imho.