My initial thought: Unless you are planning to draw only an extralight weight you should sketch something that is not only a thin skeleton line but also explores how the "flesh" is formed. That will force you to answer some more questions, which is good.

Tim: Alrighty, I've begun to flesh out the lowercase letters.

No, I haven't adjusted the kern yet.

Is it just me or: is this a joke, because at first those sketches looked like they're done by primary school kid... I thought ok I don't mind unusual creative process of others. But this digitized version doesn't resemble anything of those sketches.

Unless this is supposed to mimic child's play?

I'm a bit confused here... Anybody else as well?

Litera: Mm, child's play wasn't the look I was going for, actually. I'm quite new to the font creation process, and I wasn't looking to just make just a thin font either. I tried to give them a little bit of body(Wound up reworking several characters to adapt to the new weight). Perhaps I'm going the wrong way about it? I've been treating this font the way I draw which may be my first drawback. Pointers?

Worked more on it, adjusted and added some letters, fixed /some/ kern. Yes, the /i/, /l/ and /k/ are currently too thi, thouch in the same token I think the /c/ is probably a bit too thick.

1. Well individual characters have different weights.
2. /g/ is severely unstable (falling to the right)
3. /l/ seems left slanted because of the long bottom curve
4. some bowls are square-ish others round...
5. I don't think those tall points on /ij/ are working (bit too tall)

The thing is it's hard to say anything about this design because we don't know your desired intentions with this font. Maybe all the upper observations are desired. Maybe not. Maybe your font should be formal and with great finish detail or maybe wobbly.

Of all the letters so far I like /a/ the most (even thought it needs lots of work). It's bowl shape is particularly interesting. But unfortunately I can't say the same about any of the other letters. They don't even seem to complement each other.

This is a rough start.

What software do you use anyway?
What do you think of your own font (be critical)?
What are your intentions with this font?

Litera: Yeah, I can see that about the weights.

I agree with you about the /g/, I've yet to design what to do with /g/'s tail yet, whether turn it into an eyeglass /g/ or keep it in the same style, but more balanced.

/l/ is another character that didn't quite turn out how I'd envisioned it. I'll probably straighten out the /l/

Working at fixing the bowls, I actually know which direction I'm going with the bowls; that is, more rounded bowls.

Yeah, I see that as well, I thought it might have worked, it seemed an idea worth trying although it doesn't look as good as I'd hoped.

My intentions for this font are to create a somewhat playful sans-serif, playful but crisp and clean(no weird wobbles). I'd like it to have capabilities to be used at relatively small sizes and still maintain itself, it's kind of held up with the letters as they are, though they're quite...well. As you said, they need work. I'd also like it to be a professionally acceptable font, which it isn't at all at this point.
The fonts that partly inspired this are Steiner, Euphemia, and the slab-serif font, Memphis.

Critically speaking; I like the thought of a "playful sans-serif"(I consider Euphemia slightly playful) and base idea, execution so far isn't all that I'm wanting it to be. I'm unhappy with the wobbles and weight inconsistencies primarily, next to widths of characters being somewhat haywire. I'm aiming at a font that's professionally acceptable(As far fetched as that sounds, it's a goal), and I don't feel I'm making that right now. I believe this has potential, needs polished a lot though.

Software wise I use FontCreator 5.6 . I'm still new to the program right now, I've used it only a handful of times, cleaning up initial glyphs has taken the most amount of time so far next to playing with kern.

Based on the fonts you mentioned (mostly geometric) and even though you mention playfulness I think this is a very rough start and there's a lot of work in front of you. Your glyphs don't look geometric at all. As of yet.

I suggest you first get acquainted with the software you're using to produce some nice flowing glyphs and only after you know how to properly use your tools start developing a usable font.