Basically rota, you will save yourself a huge headache down the line, if you just change the name and change the alien models to be less identical to trem models.
It wont change anything about the game you want to make, but it'll keep everyone from whining. Just do it, it isn't that hard to rebrand this early on, and seeing as not many models have been made, changing the aliens wont be difficult either. There is no reason to be so stubborn about keeping the same name. Like I said above, it will complicate things needlessly if you keep things the same as they are now. Just do the small amount of work to change things, and everyones happy.
Also on a side note, deciding to do a kickstarter was ill advised. Trem has never had that large of a community, let alone in recent months. Theres no way you could possibly get anywhere near your target, with the community being the size that it is.