Apologies to those who bought or updated the game and tried to get past level 3 between 11pm on the 14th and 11am on the 15th (Pacific time), you would have been blocked by a message telling you this was the Demo version. This was due to a bug introduced in Beta 0.91, itself a hotfix for a minor problem with the Steam leaderboards. As of 11am Pacific Time on the 15th this bug has been fixed (but to be safe, check the version number on the splash screen and make sure you are not playing 0.91).

Beta 0.91

FIX: bug with leaderboard entries being made for zero kills/levels reached

Beta: 0.92

FIX: bug limiting the game to the first three levels (introduced in Beta 0.91)