Sorry for the delayed response folks. Unfortunately Aka to Blue has no pad support and they aren't planning one. They have hinted at a potential arcade and/or console release at some point which would of course be super cool.
Nice, think I'll get this, but can you use a BT pad with it?
I definitely hear people's interest in having some of the voiced sections sub-titled, unfortunately it probably won't happen until a console release or something. I will tell the team though!
Incidentally, I beat Aka to Blue for the first time tonight! I have to say that Stage 5 has a really brilliant design to it. Both popcorn enemy placement and boss patterns are an absolute joy once you get into the rhythm. The last boss fight is also pretty goddamn nail-biting, so if you've picked it up and haven't beat it yet, definitely go for it. Really great difficulty balancing IMO.
Another thing I want to give a shout out to: Battle Garegga's 1.10 patch (probably the default version for the US releases). This was a damn godsend for me, I don't know about others?? It completely fixed all the controller lag issues I had with the game when it originally came out, which was so noticeable for me that I put the game down for months. However, with the new patch, I feel almost no lag at all, and the game plays like a dream! Like having a damn cab in your house, wow! Popped the platinum last week and will probably return for some score attacking, too damn good.