Which 50% of the field is inaccessible? Have you got some evidence that it's 50%, or is this just more stuff you're making up the exaggerate the point. There are some shots that don't trigger, they're in the game, but they can't be triggered. There is a bug, it'll get fixed, oh well. It's not a game breaker, it's just annoying.
You want to know why BigAnt don't talk much about specific bugs until the fix is ready? Because people like you abuse them constantly if they do. For the record, BigAnt have in some form acknowledged all the issues you've talked about on here. That's not the part you're seemingly annoyed by, it's the fact that it takes them time to actually fix them.
Something went wrong, it'll get fixed. If you want a refund, go ahead, press Sony for one.