Don't think you can atm, but many many more campaigns to support the game will arrive in the future, as long as Grummz believes there are enough people interested in seeing it made.
There has been one kickstarter or some kind of crowdfunding campaign so far, but I think that one is closed for now and completed. More will come soon.
I look forward to see what this game turns into in the future. I stopped using Kickstarter as I supported a number of games and never received some of them in the end.
It was for the Indiegogo campaing which was to fund the forums, website and orthographics for the mech thmpr and player model. It has ended but the game is going to be funded from donations so you will get your chance to contribute