Very interesting concept! I like the role reversed take on a classic situation, and mechanically it's sound. The music is very fitting too.

Using only one button to adjust the character feels a little to simplistic, and I quickly realised that I could just tap the space bar periodically and it'd be a guaranteed win every time (seems like it's because the arrow always lands in the exact same position). It'd be great to see a greater range where the arrow would land and more movement/balancing options for the player.

Otherwise, great work!