The 20 year-old has netted four times in seven starts since joining the Yorkshire side in March.
Guy said: "I am really enjoying my football here and just want to keep pressing for a regular place in the starting line-up.
"If I keep working hard and doing my best in training and in matches, I know the goals will begin to flow.
"The team is playing well and if we can get a bit more consistency then there is every chance we can push for a play-off place."