I'd buy this, first out of support for you and second because I actually want to play it.
I'd say, stick it up for a quid and forget the 'lite' version. I usually find I never buy the full version of something after playing the cut down version, no matter how much I like it. I usually only hit my phone for quick blasts of gaming and the lite version usually suffices. However, I normally buy a game if I like the look of it and its under a quid.
Maybe I'm a bit backwards though...
One thing I'd add is multi touch support for the zooming. It would put me right off if I had to go into the menu to zoom in and out all the time.
If I remember correctly then Android 2+ supports multitouch and right now I can't think of any Android phone, (bar the Xperia, which should be getting next year anyway) which doesn't have less than version 2.
(EDIT: I just read nearly the same thing above...)
Another thing that is just personal preference would be using the back button to start the time as I usually associate it with getting the hell out of apps, but I understand why you did it.
Mainly just nitpicking as it looks pretty polished so far.
As for Android Dev, I recently started getting into it but I got swamped with life, will definitely pick it back up again soon though as there are a few apps I'd like to build for myself.