Aah, the age old task of smashing the heads of Moles.
You can Play Whack a Mole in the Shoebox.

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What I Didn't Do

I didn't add powerups.
I was tempted to add an "Extra Time" powerup, but it seemed like it might make it too easy.
I know that some people don't like timers, but I think on this occasion, it's the best way to make the game more of a game.
The alternative would be a 3-lives system, but then you'd be super-careful and never tap the spikes, and the game would end up being endless.

Timer's best, here, I reckon.