So this is not a Android application but they do have an Android application that is now off the market but will come back upgraded this summer called Audiotool Sketch.
But it is possible using it as a DAW on your internet browser and seems to me to be the best of the online DAWS available actually being a full scale DAW and it is for free.
In either case it is an interesting contest as you get to play on the Moogfest with a lot of great electronic artists with hotel and flight included. There is also a compilation made for the top eight selected songs. One idea could just be to translate some songs that you already made into the Audiotool DAW. Seems to me that this would be especially easy to do for Caustic users as that has somewhat similar workflow and sound engines ( Okay there is not a cool Modular synthesizer in there... or a 8 bit synth... but you can also use samples. )
In either case if this seems interesting to you go and read more here: