This is a really solid game. The controls were a little stiff and some of the upgrades were a little underwhelming all in all I give Hells Bells a 9/10. I am confident it will be an an amazing game one day.
I'd love to hear more about why you felt the controls were stiff. I think playing for so long has made me a bit numb to things like that, so I'm really interested in understanding the issue better to improve it! :)