Hi,
Make carefully do not excede the chip maximum rating values when all the 25 LEDs are on !
In any way, if you can rearrange the tile in a matrix , and your LED have a high peak current limit, you can drive with a fast multiplexer rate without have a flicker effect.
The result depend only on your firmware and MCU speed, to switch row every PWM cycle and change all the columns PWM values.
For the human eye persistance effect, a LED flashing at the right speed, appear as a fix light. Also the average power will be further reduced.