I've found Kongregate to be difficult more than once though. The problem here is that I couldn't see any bugs (and still can't), so the only thing I could think of doing is removing it altogether, removing the ads altogether, trying to get it to work on IE then putting it up new. Even so, unless you get a 4-star rating, Kongregate doesn't pay I think.
I'm trying to think of a way of totally reworking it, but as you say, 8-direction movement is a tough one because it's needed to 'explore' but it doesn't really make for a great shooter style. I was trying to think of a way I could make it something more of a shooter - perhaps every time you go off on a mission or to find asteroids, you have to pass through 30 seconds or so of shoot-em-up .... but then that spoils the damage aspect of the game which is one of the best parts.
I have tried MarketJs but no response. I think it's just seen as too complicated and not the sort of game with mass appeal.
And the problem with marketing it myself is I dunno where or how to sell it. I don't enjoy marketing at all so I'm not sure that would work out too well. I was rather hoping it could get some views on various sites and then I could consider a demo but it's hard getting many hits.
You're right that Board Horde obviously won't fit onto a phone screen, or if it does, it'd be very hard to see what's going on. I've just started messing with phone games and it's hard to get the dimensions right. Zoom would spoil BH a bit, but if the option to zoom in and out was there I think it would work. So you zoom out to see the entire board and then zoom in for moves. It would work but I think that would be quite tricky to program.
Let us know when there's an update :)