I totally misunderstood the game about 1 input. I only saw one input that is click button and thought it was all there is to it.
My View as an outsider to clickers:
The only thing game is missing is the hook to play it for me. I don't know why player needs to get high score.
My recommendations would be to put some context to the game like you are killing monsters and the score shows the number of monsters player has killed.
I know it's been done with limited resources and it's great with what you have but my feedback is this after trying it a couple of times.