It's funny, I originally thought there's no way it could be fun on mobile with those controls, but indeed, it sort of works. For now it's possible to reload with a two finger tap (strange Unity touch->mouse mapping), but of course that's hardly usable.
I'm going to release a post-jam update, including an Android version, when the voting ends (Sunday). I was thinking about a mobile-only reload button below the cowboy, but I'm still considering my options.