It's their first game and they're using kickstarter. There's a number of reasons to not back the game.
1) They have 0 experience with setting a budget or long-term timetable. They could easily run out of money while the game' half-completed, which would immediately cause either 2 or 3.
2) The game could get canceled. Kickstarter gives them their money as soon as the funding ends, and they're in no way obligated to finish their game. They could either have internal drama and separate, this could all be a scam, or they could just run out of funding and we'd never see the end product.
3) We could get a small or unfinished product. The first worlds could be amazing, then the later ones could be incredibly small or buggy.
DLC? UGANDA WILL NOT HAVE THIS SICKNESS!