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Couldn't they use the overwing slides as flotation devices and stay on those instead?

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Because they were told to evacuate there, if you take a look at the official audio transcript from the accident:

place both arms through the straps and hug it to your chest. flight attendants are pointing out there are a total of eight exits on this aircraft, two door exits in front of the aircraft, four window exits over the wings, and two door exits in the rear of the aircraft. once again, two door exits at the front of the aircraft, four window exits over the wings, and two door exits in the rear of the aircraft. each door is equipped with an evacuation slide if directed to exit... the aircraft jump onto the slide and move away from the aircraft.

The rear exits were largely blocked by water making the forward exits the only ones with slides, those slides were utilized as evidenced by photos included in the report: Photo of passengers on wings after evacuation

(source)

With only half of the slides available the wings also had to be used. The wing slides are intended only for ground landings and do not double as rafts, as per the accident report

According to TSO C-69c, Type IV is a combination inflatable exit ramp and wing-to-ground slide. The off-wing ramp/slides were intended to be used in the event of a ground, not a water, evacuation.

As such the over wing slides could not be used in this case.

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    $\begingroup$ I wasn't aware that the overwing slides were not designed for water evacuation. Thanks! $\endgroup$ – user1202136 Aug 5 '19 at 16:21
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    $\begingroup$ Could you explain why the over-wing slides were not designed to be used as rafts? $\endgroup$ – Robin Bennett Aug 6 '19 at 14:34
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    $\begingroup$ @RobinBennett that is a good topic for another question here. The quote is the full citation from the report and does not offer an explanation. TSO C-69c might offer more explanation. Broadly if the FAA does not require something companies may not build in "extra features" as it may cause them to be subject to a more complex certification process. $\endgroup$ – Dave Aug 6 '19 at 14:45
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Per the accident report from the NTSB, only the four exit slides (two at the forward doors and two at the aft doors) could be used as rafts, as the aircraft was configured for extended overwater operations (EOW). Regulations required there to be enough capacity for all passengers if the largest raft was not usable. Each slide/raft was rated for 44 passengers, or an overload of 55 passengers.

During the ditching, the aft part of the cabin rapidly filled with water, preventing the use of the aft two exits and their slides. This meant that the remaining rafts could hold a maximum of 110 people if overloaded out of the 155 people on board the flight. That would leave at least 45 people on the wings.

The report states that about 87 people were rescued outside the two rafts. Many passengers rushed to the overwing exits, creating a backup, and flight attendants had to ask passengers to come forward to the rafts. The overwing exits are not supposed to be used unless other exits aren't available. There are also life lines to help passengers when out on the wings, but these were not used. Since the flight attendants are located on either end of the plane they were too far away to advise the passengers about this.

The report further discusses that even the two usable rafts were not technically required (the flight was not an EOW route), and the remaining passengers would have been in danger of not surviving the cold water if they had not been rescued so quickly.

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