This is a cool idea but a rather insubstantial game imho.
But I mean for a game to kill a bit of time I suppose it's okay. Could use some music and the over all pace is pretty boring and non engaging it might be some for some but not this fellow.
Some suggestions (Yes I know this is a 72 hour game jam but it was made by 5 people)
1)Have an indicator to show where the arrow is when it is off screen.
2) occasionally the arrow disappears so for future instalments I hope that is fixed.
3) the controls are very stiff,
You may already know this, but...one of the things you can do is make here move with a specific value (for me I use "XV" as the variable) where xv becomes a higher and higher positive number when the right arrow is pushed, and a lower and lower number when the left arrow is pushed limiting at between -7 and +7. and have the player's movements based off that value, where +7 makes the player move to the right at max speed. it makes a huge difference :)
4) back to the music. The repeating wind loop kinda makes things a little more boring :( Just thought Id mention it.
5) this is pretty standard nowadays but have the M key mute all audio, the P key pause and the R key reset.
I know this is pretty standoffish for my review on a 72 hour project, but given the 5 people you had working on it so I can hardly see why these weren't put in, I guess a slip of the mind.
Really though the this is just how I felt It doesnt mean its a bad game though
and I hope to see a more fast paced version of this game, its a good idea!