OK, I have some feedback; and it is only my opinion; but first, a graphical glitch:
I installed the game on my Note 3. Works OK but there is a notable glitch on the left hand side of the screen when viewing the inventory or end of level screen. The slight gap on the edge where the level is unconcealed by the UI contains 'fuzzy' distortion; it is difficult to describe in words, so I will need to send you a screen capture when I next get a chance. (Bed time)
Whether or not your game is causing the issue and not the OS or hardware is not clear at the moment.
I much prefer playing with a game pad; jumping around with without falling off of tiny platforms whilst attempting to hold on to the phone is quite an awkward experience; being a large phone, holding the bottom end of the screen alone can actually reduce your grip of the sleek yet slippery surface. This spoils the fun for me; even if it was the platform game in the world, I would still find it uncomfortable. My thumbs have to bend at about 70 degrees to press even the big buttons, whilst my index figure is all the way up the other side trying to keep the phone steady; the muscle fibres in my hands are telling me they do not want to be treated so bad, they do not want to bend that way. Blame the phone!
I'd prefer it if there was a mode allowing one to use the whole left and right hand side of the screen as ghosted or hidden buttons so that the device can be held as it is held for most applications. Drag gestures for jump and hit could work. Perhaps that would be a bit exhausting. Maybe the top left and right could be for jump, and lower left and right for attacks. I am guessing that it would be a good option for people with small hands and big phones lol.
Here comes a mouse drawn sketch diagram, warning!
The main thing I am struggling with is getting my thumbs to bend unnaturally to press the buttons.
If I were to copy and paste a PS4 gamepad on the image above, you might find that the thumbs line up with the buttons more towards the top, and the pinkie fingers would be at the bottom. Personally I would of slapped together an 8 direction arrow button circle on the top left, and action buttons on the right; leaving the lower end of the screen for HUD. But that's without any reflection on what you have planned.
Obviously if my thumbs cover the screen, you will not be able to see what you are doing; which limits where the buttons can go. Probably central at the bottom and at the top corners of the phone.
Even when holding my Samsung Galaxy one; much smaller; I am getting a similar feeling of discomfort
Anyway, that is my opinion.
Now another topic for discussion is feedback for when sound is unwanted. Does ADK provide features for vibrating the phone to reflect damage or impacts? Would be interesting to see how it works for when sound needs to be turned off. Even with sound on a little force feedback would draw one into physics of the game world a bit more.
Keep up the fantastic work; looking forward to trying out new weapons
