Have not heard about any of these apps?
Then you owe it to yourself to check them out.
SunVox one of the coolest apps on Android and free for PC/Linux/MAC.
Virtual ANS amazing and different.
Pixitracker hmmm not really my thing but an easy way to go get the Chipsound without complicating things plus that it looks all pixelated and stuff. Even with some pretty pixelated aliens floating down the screen if you want...
Pixivisor is one of the great unsung low tech magick video experiment thingies for Android and personally love it.
Remember that the files are interchangeable from O.S to O.S.
P.S read that SunVox is on 90% towards the next release and hope it comes out on my birthday as every update always comes with unexpected surprises and useful goodies.