Thanks for taking the time to provide feedback!
I agree with a lot of the armory QOL ideas, will add to my todo list. Tooltips which specify effect details and mechanics will be added in the future as well. There's no system for switching between multiple ammo types in combat yet.
I wanted to add a bit more flavor to the rather old K-50 with the variants, and they're mostly the same tank but with different/better installed modules, so barring armor material I can manually upgrade a K-50A to a UM. Later vehicles likely will have less straight upgrade variants. My plan for progression/campaign is to have a limited supply of units, and create choices where I might prefer having cannon fodder or more expendable units for some battles.
As for the units, I'm modeling a wheeled gun vehicle so maybe that'll show up in the next build :D but yes I'm planning to add more interesting vehicles with compelling gameplay benefits/challenges.
As you've pointed out, the rockets are quite overtuned and I've reduced their armor penetration for the next build. Especially since the enemy gets to shoot them back now. Glad you like the infantry gameplay so far, they're going to be continuously improved as well.
Replay is a good feature but going to be a bit tricky, perhaps in the far future. Thanks again for your detailed thoughts!