Hello CryptRat, thanks for the complimets and the advice
Exactly what do you mean with the ladders? It must be a bug, every wave should be harder and longer than the previous (i confess than it should be better make the proggresion to)
I tried again and the enemies indeed won't have the time to appear from a point.
For example right now the next % upgrade costs 51 and each wave goes 0-37-74-111%, it will never last longer.
What I assume happens is that the period never goes down below the number of % upgrades.
