Pretty fun, I like the apparent balance between realism and arcadeyness (I've never driven a real tank). During my first try at the tutorial, I damaged the main cannon and wasn't able to defeat the one enemy with my backup gun.
The mouse movement also feels weird, I don't believe the aim is moving based on raw mouse input. I'm not sure how to describe it but it seems to move in steps.
I'm excited to see where this game goes.