It looks nice, but it is a bit too generic. Add a bit of more things that will stand out. An excellent story maybe? Still, that would be fun, would love to download that.
Dual stick on a touch device always means wrong platform IMHO. I know it's common but it always sucks. Also, how do you know the game size without having the assets yet? In any case, a lot depends on execution and playtesting. Make a prototype with placeholder gfx and try it out.
You could let people choose from a few characters. Add a girl too maybe. Sounds like a cool idea for a game. Maybe have funny weapons that you could make out of farm equipment and tools? I can't think of anything at the moment though (which is strange for me).
My recommendation is to just make a prototype and see if that plays well. It is absolutely possible to make a game that is addictive without using any proper artwork. Tweak the gameplay and lock down the game mechanic before you start adding graphics. That way you'll be able to tell how good your game actually is before going to all the trouble of worrying about which angle to market it from
Do you have some pictures and/or videos of the gameplay. If you're looking for testers, I think it'd be best to post your game in the upcoming section, there should be plenty of willing participants there! Good luck with your game