The type is super murky.
Type is generally something you don't want to stylize too highly (unless it's a title). Just pick a nice typeface, turn AA off, set it nice and clean. Remember, the only reason it's there is for the display of information, so the more difficult it is to read the less effective it is.
For small pixel-based type, there are a bunch of pixel fonts (Silkscreen is a basic example, you can find a ton just by doing google searches). But there are also faces that were specially designed at the start of the internet era to work beautifully at a variety of small sizes without the use of AA. Verdana, Georgia, and Tahoma are all worth looking into, and your computer should have them installed already.
Also, from an interface standpoint - it's odd that you have the hero/enemy HP displays on the opposite sides of the screen from the hero/enemy sprites.
So, yeah. Sorry for not being able to critique the sprites more, but the other people here will do a better job of that anyways.
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