ENT Gaming

I assume the point of the invulnerability is to handle the bug where if monsters are killed before the next spawns then it skips a level.
The problem with invuln is it makes the wind race boring. The cool strat for wind race was to build ON the spawn location in a spiral, but now if you do that the mbos just run past your towers because they can't take damage.

I would recommend you to find another way to handle the next level spawn if that is currently the problem.

There is no other system, invulnverability will continue for skip bug.

You can play with wind race with no issues, the point of wind is mass towers, this not meaning on top spawn.