It's a nice, though fairly generic concept, but it's hurt a lot by you not being able to finish it, sadly. I like how the weapons were all raycasts, that's very unique compared to the other wave defense games.
I honestly don't know what to say since it's too unfinished to fully comment on. I will say the fact that the enemies chase you instead of the tree is a bit off, though. Since the tree is what matters they should ignore you and focus on it instead.
Honestly I feel bad for rating it low. I hope you can find the time to finish it and make it what it's supposed to be, though!