I recently bought Knights of the Chalice and would like to share a few thoughts.
First of all, congratulations on your first game! I really like it so far, especially challenging well-polished tactical combat.
I hope to see more games from you in the future, and that's mainly the reason for the comments below. So, here goes.
Two things that almost put me off from even trying the game (but thankfully didn't in the end)
The title - Knights of the Chalice sound like something that is going to be about the Holy Grail, King Arthur and all that stuff.
The resolution - I think many people are going to dismiss your game based on it. I don't consider myself a 'graphic whore', but it almost did it for me, too, before even trying the game out. 320x240 is really low. I think, that, if you increased the resolution a bit (and you can increase it a bit more simply by displaying more of the map on screen at once), you would attract a lot more of potential customers. However, if you are going to use it in the future, please consider using some filters that make it look better when rescaled to higher resolution (see DOSBox and Exult for examples).
The second thing I'd like to talk about is the marketing - it would seem a lot of potential customers never heard about your game. I found about it basically by accident (I sometimes lurk at the rpgcodex). I think you should involve yourself more actively in promoting the game - don't wait for people to find out about it on their own, bring it to them. Find communities interested in games of this type and present your game to them. Send out some review copies to old-school-friendly (not-too-much-next-gen) gaming publication (both on- and off-line). Send the game to the next Independent Games Festival.
And another suggestion that would place your game to the broader audience - have you considered contacting Nintendo and porting your game to the Nintendo DS? I think it would be a perfect fit for that platform - the base resolution is already exactly fit for that console so you wouldn't have to change any of the assets. Secondly, a strange as it may sound, it seems the handheld consoles (specially the DS) have became a refuge, of sorts, for the old-school gaming. In rpg-department, for example, see the Eye of the Beholder remake, new Wizardry games in making for the DS etc.