Please note that because there will only be a few of us submitting reviews in the pilot the scores you submit will be a lot less secret. This is due to the fact that ThinkLab will publicly display the average scores that the proposal receives.
This shouldn't be a big deal because for the pilot your scores are inconsequential anyway!
However, any feedback you have for the team definitely is consequential! Just please note if you have feedback on the research plan it might make sense to wait until phase 2 of the project. That's when the project will be funded such that collaborators (you) earn money. I'm not sure whether you care about that at all but thought I'd point it out.