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Good game. But how many times are you intending to submit it before you actually finish it? I can understand doing it once to get some feedback, but then you should have gone back and added all the features you intend to; THEN re-submit it one more time for bug-testing before the final submit. The way you're going, you're going to have about 10 versions of it on NG before it's completed.
In terms of gameplay, it's still a little easy beyond the first 2 levels. Just stack up on swordsmen and send em all in at once. Beyond the 2nd level, it's a walkover - you need to make the enemies do more damage (cluster grenades?), as well as raising the castle HP.