A Family of Grave Diggers just recently started a Kickstarter campaign. The game is already in Alpha, and the Kickstarter is mainly to fund upgrading the graphics and adding better music. The game is being made with modding in mind, and as of now you can even create a tower defense game within the game using what is built in. The creator of the game, Ludvig Larrson, has plenty of experience creating games and has titles like Quest for Alliance I & II, Ghost Force, and Kyushus Devils under his belt.
As of now, there are still early bird rewards available. So if you're at all interested, you might want to move quickly to snatch one up before it's gone.