Wasn't sure what the idea was for pressing R, it didn't do anything for me. Overall not a bad idea except it feels like every other mobile game ad you've scrolled by. There wasn't any clear instruction on the game or win/lose states. The lack of a storyline I think speaks for itself as there isn't any sense of rivalry.
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I'm 100% sure that you skipped on reading the description which explains the R thing. Also that you played for maybe a minute at max and probably closed before even attempting a high score/ shooting once cause if you did play it to give actual feedback like others you would see the global leaderboard in the beginning & the end of the game. Again about no clear instructions - only if you read the description.
I could add a backstory to the game but doesn't really make sense to do so when I choose to focus on making my game function & work properly as opposed to adding a 2 minute backstory in description for the sake of 'storyline'.
Nevertheless, Thank you for your feedback.