Like other games of yours I've played, this felt well balanced. Some of the ways the mechanics and numbers interact were a little confusing and unintuitive at first (like the relationship between weapons/ranks/troops and what the actual value of a new level of each is/how it impacts things), but not too complicated to work out. (but I didn't play long enough to be able to understand recon mode at all, or exactly how the bar under the enemy portrait functions since I didn't see it filled up past 15% or so, though I could guess)
I enjoyed the level of decision making required, small increments of minmaxing for hitting the next highest wave, and fiddling with the energy and metal sections before idling a bit. Good rate of progress, good balance, nice unlock frequency.
This might just be my experience, but when I unlocked the prestige feature my heart sank a bit and that's where I've stopped playing. I didn't realize a "full reset prestige" system would be here, and glancing at the first 1.5 columns of prestige upgrades, their costs, and how much I can prestige for, I don't feel interested in replaying it multiple times even if there's actual new gameplay deeper in. (I played up to highest wave 77 and can prestige for 28 points but haven't prestiged)
Run-of-the-mill prestige angst aside, I did enjoy what I played a lot, and for me this is easily the most complete and well-paced game of this jam.