Devaney joined St Mirren on-loan to the end of the season in January.
The midfielder was Man of the Match on his debut in victory over Hearts and against Airdrie he scored a wonder goal in their FA Cup win.
"I want to challenge myself at this level and improve my all-round game," he said. "I'm really proud and, hopefully, I can bring this into the rest of the season.
"It's a lot different playing here compared to playing in front of little crowds or no crowd at all.
"The football is different but I've had experience of it in the EFL Trophy games. I really enjoyed the challenge and, hopefully, I can kick on from now.
"United told me they just want me to get used to the style of football. I'm used to very possession-based football.
"Going into games, we might try to dominate the ball but there may be times where we have to concede having the ball. They just told me to enjoy the challenge, bring the things that I've learned back in the summer, and I'll be a better player for it."