Here is the level prototype. 

Here is a summary of the wonderful feedback we got:
1. Map potentially very big. Very difficult to explore the whole thing in 5 minutes (the target playtime)

2. Might get very boring to just roam around, have fun things to do while exploring.

3. Not having a HUD will be fine.

4. Player speed to slow for the map size.

We will be making the map significantly smaller. This should solve most of our problems.