I soft archived my Steel Seraph site on the bird place months ago, but I fixed a fullscreen bug that in some stages caused the display and some foes to ignore the screen's right side. The fix is live on Windows + due for Linux/Mac. The game is permanently $1.99US as well.
Edit: Volume option on 'audio options' now limited between 0 and 100. Bug where it could go negative or past 100 fixed.