I've not encountered any bugs besides the well known alt-tab problems.
The gameplay is fun and engaging, the level-up tree is deep and interesting and there's a great variety of shops and things to buy/bless/upgrade.
My only disappointments are the voice acting and the way you've used the music.
Voice acting is very uneven - the Tutorial narrator and Jos are very good, everyone else pretty bad. The sister has a Spanish accent? Given that it's a $15 Greenlight game I wasn't expecting Robert DeNiro but I'm disappointed you couldn't find actual Canadians to track this.
The music is FANTASTIC but is used in a very uneven way. The Loading screens have the best music, but it stops as soon as the Continue button appears (BTW the sound effect for clicking Continue is horrendous, like fingernails on a chalkboard). I want to hear more of that great music. Don't stop it, let it play while we finish reading the Info cards before hitting Continue.
At the same time, there's only ONE track used in the screen you spend the most time in, the Night Strategy screen, and that tune is not the best one, it gets old REALLY fast. Can't you mix in some of the Loading screen tracks?
Also, I've been finding little text errors, should I tell you about them or is it too late to fix those? A big one would be on the cards that show Weapons Stats - Should be Damage not Damages.