Thanks for your encouraging words. Probably because we didn't do any paid marketing.

This is not compatible with Ginger Bread... you will loose lots of potential downloaders.

I'm sure there is a reason for this. But it indeed is something OP may want to consider. Gingerbread is almost 50% market share.

Source: http://developer.android.com/about/dashboards/index.html

As simple as the graphics are, I'd wonder whether it couldn't have been done another way. You're definitely right, not targeting 2.3+ is kind of a big deal.

The game is very decent, though; runs very well on the Nexus 7, solid gameplay, nice mechanics.

It was originally supposed to support 2.3+, but due to timeline constraints I had to release it as 4.0+. I'll be looking into 2.3+ for a future release though!

What was missing in 2.3 that made it non-compatible?