Thanks a lot for the feedback!
We indeed had some "issues" defining our initial vision for the levels, issues meaning we didn't discussed it since the project seemed to be coming up nicely and we realized too late that we all built towards different ideas.
If the project moves forward we will define more clearly our intended type of fun and be more cohesive in our approach to the level design, and if it doesn't it's a point of improvement for any future project.