Hyper Light Drifter Dash Challenge

#!/bin/sh
DASH_COUNT=10
COUNTDOWN=5
KEY_PRESS_LENGTH=15000 #microseconds
INTERVAL=0.11
INTERVAL_INIT=0.14

while [ $COUNTDOWN -gt 0 ]
do
    echo $COUNTDOWN...
    let "COUNTDOWN--"
    sleep 1
done
echo 'starting...'
sleep 1

for i in `seq 0 $DASH_COUNT`
do
    echo "dash = $i"
    xte -x :0 "keydown space"
    xte -x :0 "sleep $KEY_PRESS_LENGTH"
    xte -x :0 "keyup space"
    if [ $i -lt 4 ]
    then
        sleep $INTERVAL_INIT
    else
        sleep $INTERVAL
    fi
done