I think "a" and "e" break the flow a bit, especially the "a". Try to make them more cursive, like your other chars.

Here is a somewhat similar design of mine in case you are interested:

https://dl.dropboxusercontent.com/u/46459223/font.png

I really enjoy it. I am a little bothered by the ‘m’. I don't know how you could do it but I would try to make it less heavy.

If I recall correctly, some monospaced typefaces lighten the |m| by shortening the central stem.

Are monospaced typefaces supposed to be absolutely consistent in line weight? I think I always assumed you can compensate for dark areas like these. The /m is invariably going to be problematic in a monospaced font, isn't it?

I always assumed you can compensate for dark areas like these

Yes, of course, but given the modularity and adherence to a very small grid of this design, I think it could be right to look for solutions used in pixel and similarly strictly constructed typefaces.

That makes sense. I can see the solution for /m, but for the other characters I don't think such a solution would work. M/N/W/AE/OE/&/@/Ø are particularly too dark. For OE I would simply increase the counter a bit. For Ø perhaps the slash within the counter should be lighter than outside it. I would prefer to remove the slash from the counter completely, but given the point size at which the typeface seems optimal, I don't think the slash will be obvious enough if you remove the part within the counter.

It seems quite impossible to fix all the dark spots using a pixel-based solution. But I guess since the design is inspired by pixel typefaces, it may not be necessary to remove all dark spots.

Thanks everyone for your valuable feedback!
I guess another trick to lighten the "m" could be to widen the grid slightly for that character, making the glyph a little wider, but keeping the character spacing? I was thinking about making this into an old school CAD font in the .shx format. In that case I would not be able to vary line thickness for individual characters or strokes.

If you widen all letters enough, indeed the dark spots should mostly disappear, but I think you will have to wide the characters too much to remove the dark spots completely. If you widen the characters just a little, characters like /m will still look relatively too dark even though on an individual basis you've lightened the /m. It's worth a try though. Your characters are quite condensed, so you do have some space to work with.