More toy less of a game, click on the tiles and grow your red blocks, whilst the evil blue blocks get in your way.

Its a slow chilled game, there is no winning just start getting some red blocks grown and then sit back and watch the growth cellular automator do its thing.
If you really want you can even help the evil blue blocks.

Holding left mouse button over a mud tile (brown) or a block (red or blue) inject nutrients, which will help them grew, nutrients will spread over time.

Red buds a new block in surrounding tiles when its grown enough, Blue is a weed, able to grow anywhere it can get the nutrients it needs.

Each block responds to nutrients and how crowded it is, so the way you click and grow can either help or hinder blue.
Right mouse button allows you to move the camera, right and track wheel zoom (but buggy on macbook pro trackpad).

Its a slow game, often just leaving it alone to run for a bit can help unblock areas where blue has taken over.

OS X build up first, Windows and WebGL incoming

Build using Unity