The good part is that the code is there on Git ( and since OP didn't put links, here we are:
https://github.com/horizontalsystems )
I'd still like to hear about 3rd party review of the code, made by somebody I trust (yes, I know that this will take time).
At least the apk is indeed made from the Git code (according to walletscrutiny.com), good!
OP, you seem to be on the right track, but it'll need time.
And a question: does this wallet work with hardware wallets? (I want to see if it's a worthy competitor for Mycelium, or "not yet").
It doesn't work with hardware wallets. But we are looking into it, if people need it we will add it.