I think once you play it enough, it does expose some issues.
The progression system has problems. I’m on level 11 or so and i can’t remember the last time i changed my equipment. Boxes just contain low level items or useless items. Sometimes even higher level items are just worse than lower level ones, even if the higher level ones are also higher quality. This doesn’t seem to make any sense.
Balance problems with the towers. Why should i take a rocket launcher troop? Don’t even pay to hire him, the plasma guy is way better from what i can tell. The laser one is also kind of questionable.
From what i can tell you want Plasma, Cryo gun guy to slow, and then two of the following: Shotgun, assault rifle Sniper. The sniper starts off pretty bad, but once you get him some levels and a better gun they can do very well.
The plasma guy is just insanely good, but you need to hold the line for a while to afford him and then their spots are limited.
I don’t know why you would not just use the cheapest cryo 99% of the time. If you have absolutely unlimited money in a mission you can upgrade to a more expensive cryo later but you’re still never going to use fire probably.
Four slots is too small to experiment at all. You basically require plasma and cryo. Then you need at least one low cost troop, which laser and rocket cannot be.