You are entitled to your thoughts and feelings, we all are… so here’s my two cents.
Many kickstarted games don’t make it to release and most games take longer to release than planned. If the devs did anything foolish, it was to state an expected release date so early into the process. I haven’t followed this game too closely after supporting it, but I vaguely recall something about them rebuilding a lot of the engine tech to suit both their current and future needs. Maybe they wouldn’t have done that if the early support was less, anyways I’m glad they had enough support to take the time to do it right instead of rushing out a sub-par product.
I don’t know why you are furious that “[you] will get [your] game at the same time as someone else chooses to buy it.” The perks of the various pledge levels clearly state that anything less than €60 will only “Get the game on Steam when released.” Beta access only started at Lord or higher, if you really wanted that perk you should have paid for it then. I can see a kickstarter backer with beta access being annoyed with steam access, depending on price, but it makes sense from the developer’s perspective and most people probably don’t care.
Your “reward” for helping to get the project off the ground is that the game actually exists, and your name in the credits. Expecting much more is greedy of you.