How to get your PNG images really tiny!

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Grey Alien

@sswift: before I download it and check it out, are you able if it is able to "Auto-compress" by checking out the number of colours you've used in a 32 bit png (with 8 bit alpha) and say, hmm, well this can be turned into an 8 or 16bit png (without colour loss), and yet still retain the 8bit alpha channel? Thanks in advance for any answer. I asked this because the graphics in my latest game are consuming a lot of disk space (and thus affect download size)...