It depends on what your core mechanics of the games are and the myriad of edge cases that arise as a result of those decisions. It can very well become exponent

It depends on what your core mechanics of the games are and the myriad of edge cases that arise as a result of those decisions. It can very well become exponential and it is a big reason why indie games are simple, anything more complicated to emulate a studio production, would quickly balloon into incredible amount of work and the biggest risk is not knowing if it will mount to anything. I learned the hard way and realized just how hard game development is and how much we take for granted the human cost. You really really must love games to be involved with them. You cannot do it based on ROI calculations it really requires passion and patience.