Hey Superku! Looking GREAT!
Regarding getting on Steam - KarBOOM ISN'T on Steam, but that doesn't mean I can't give advice
Once your game is on Greenlight, its Greenlight page will get an INSANE amount of traffic in the first few days as Steam automatically funnels the Greenlight community to new pages.
KarBOOM's Greenlight page, for example, received 2167 unique visitors on day 1, 2039 on day 2, down to about 200 on the 7th day, and it just dropped further and further after that down to an average of about 1 per day (this obviously has a lot to do with KarBOOM's lack of attention in the press and my lack of work in that regard for a long time). Maybe you'll get more than that through press, but that can be unpredictable; your Greenlight launch days basically GUARANTEE you a lot of traffic, regardless of what else you do.
It got lots of "no" votes from users who wanted something playable (there was only a very outdated demo available then, I think), and from the fact that I didn't put much effort into the Greenlight page at first (I didn't realise the traffic it'd automatically get, and I planned to only try to draw attention to the page later after spending more time on it).
So, I
strongly recommend you take great care in setting up your Greenlight page, you already have a well-thought-out-demo available, and you already have your game available for sale at least through your own website.
Seriously. You'll get a LOT of one-off impressions quickly. These can turn into sales and word-of-mouth.
I know you want to get your game on Steam first, but I also strongly suggest you get a "Humble Widget" set up so you can sell it through your own website (see
their application form to see what it's like). You'll get
95% of the sale price, which is much better than the (approximately) 70% you'll get from most other distributors.
Finally, regarding "Desura and the like" - Desura is GREAT. Others... Well... any distributor will only send you money once they owe you a certain amount. At least one of my distributors has sent me no money, because not enough sales of KarBOOM have gone through their website. Plus you have the obligation (perhaps even contractual) to get updates/patches to all your distributors in a timely manner, each of whom prefer the game is sent to them packaged in different ways or by different means. This can be a huge hassle with updates (this hasn't been a huge problem with KarBOOM, as it hasn't been updated since launch, but I
am working on changing that).
So in summary, there are TWO big things I wish I'd done differently with KarBOOM's launch, which could be worth thinking about for your game:
1) Launch the Greenlight page at the same time as the game's release - (even if I didn't improve the page, this would've been SO much better)
2) Only distribute via the game's website and Desura (and, of course, Steam, but that'll wait for a Greenlight - you'll need around 4400 "yes" votes to crack the top 100 at the moment, and that's still not a guarantee Steam'll pick you up)
I hope that's helpful!
Keep up the great work with such a fun looking game!
As long as I can buy it one way or another!