This was an interesting and creative idea for a game. It's a simple idea, but fun and pretty well executed. It gets pretty tricky near the end! Very good for a first game!
If there was anything I'd personally change about the game, I think I would make there be a distinct sound effect each time you tick a counter, because sometimes I wasn't 100% sure if I properly hit the button or not without looking at the counter as I was pressing it. I'd also probably add A, S, and D labels to the counters to make it more clear that you can use those buttons as well.