It was fun.
The revolver mechanics is something new. The scrolling and shooting was little hard for my wrist though. :-)
The upgrades were nice addition.
It took me really long time figuring out that I need to start the wave by clicking on time wheel on the top. I was running around several minutes trying to figure out why there are no enemies to shoot.
The visuals are nice, some animation (even small one) could liven it up.
Good job! :-)