If you got SimpleRockets for free last year (or paid for it), Steam keys are available upon request

Request here - PC version only

If you are a freebie your response email will contain something like this

"Looking at the database, it looks like you got SimpleRockets for free using a coupon. I have reserved a Steam key for you, but please consider buying SimpleRockets. It really helps to support us and allows us to keep developing new updates and games. "

I'm posting it so you can decide for yourself if you should or not and be aware of entering giveaways since you may be able to get your own already (I'm not trying to stop any giveaway). It also has cards which to a much lesser extent also supports the dev through the sales. Though because it is new and so few copies, the sales aren't that high at the moment.