I'm glad you enjoyed it and managed to find some of the hidden stuff.
There was actually more dialogue that refused to trigger, we just had very little time for play testing in the end.
The design for the mech worked around velocity and drag so it was intentional but we were lucky with some of the initial control designs working from the outset, I just didn't know how it would behave on the big mechs.
There were weapon unlocks for the Mortar and Railgun and a level 1 upgrade for all but the railgun scattered around.