Thanks for checking out the game. Thanks for noticing the boot splash( you can find it in the Project > Project Settings > General > Application > Boot Splash. If you did not know ^^)
Repair:
About the repair thing, its just a visual bug (I think).
I coded it like when player enters inside the mech sprite area, the build icon will appear. When mechs are near each other I think the signal to exit and enter gets overlapped and hides the build icon.
Wave Transition:
I coded the wave transition way early into the gamejam and did not have time to change it when I was doing balancing and it got pushed down. I do thing it breaks the flow but it worked properly so I did not touch it.