Looks fun and I want to play more...
Bug report: if you die and you're on the screen with the 'Play again' button, it's still possible for the Upgrades scene to show (with no upgrades on it). When you click 'Skip upgrades', you're back in the game with 0 hearts and you can't die. Your hearts go up, they go down, even to 0 again but you can carry on. I recorded a video if you're interested.
I've had a couple of other issues. 1: the camera pans too slowly, so that I can be almost off the screen before it'll show where I'm going. 2. I got stuck on a piece of rock. I had gone down to the bottom of the screen and the camera wasn't panning any further. Then it did pan as enemies came in, but the controls wouldn't let me move anywhere. Needs a bit more debugging!
However I love the music and the way the western theme has been carried through to the cursor and the HUD screens.
