This seems to be an issue for a lot of the games, both in this jam and in general. (I use the Dvorak keyboard layout, which is even worse for this; I've been switching to QWERTY a lot while rating games here.) I know that if you're writing the game directly in JavaScript, there's a way to get the position of the key instead of the letter that it types, by using the "code" property of the event rather than "key", but I have no idea if it's possible to access this from Unity (and if it is, it's likely completely different).
(Also, about the game itself, I agree with other comments saying it should give clearer feedback when you hit an enemy. Also feedback when you get hit that doesn't require you to look up at your hearts would be nice.)