Hey, it's nice to see an RTS for once (and one that isn't just trying to copy sc2) I'll be a bit more critical because I'm more invested in this genre:
The engine is solid, the only issues I had were that units feel like they slide (they don't start moving to where you tell them to instantly which is fine but they do turn instantly which is weird) and sometimes the way that fog of war gets revealed seemed off. Would also be nice to be able to queue unit commands.
The idea of capturing bases that autoproduce units is fine but I didn't like the execution. First of all all the units seem very random and have nothing to do with each other so its difficult to get invested in the different "factions". I don't get how the buildings work, they don't have any tooltips and as far as I could tell they don't cost any resources? Can you just spam buildings forever? After I built them I figured out that they buff your units or something but it's not very clear, and it would be nice to know that before you build them. Personally, I would prefer if there were less different factions but they were more fleshed out with more buildings and unit options.
Units die way too fast so you cant micro them very much. I just waited until I got a bunch of units and sent them all to kill everything. That's kind of boring imo, you want the player to go out on the map early and engage in smaller fights. It also makes unit abilities not very important since a lot of the units are just cannon fodder. Control groups worked fine but they could maybe show the number you assigned them to so you know you made a control group with them. There were no rally points as far as I could tell? I liked that the map expanded and new enemies appeared but without being able to rally units it gets kind of tedious on larger maps.
Some skills like that of the skeleton are way too important and others aren't. If players don't click on enemy units and read them it could be a problem. I only realized what the skeleton did once I trained some myself so they kept respawning in my base and I had to set up towers there. Also the AI doesn't seem to know how to counter the skeleton either.
There was something wrong with my minimap, not sure why. It split into three:
I don't want to come off as too negative, I think you have a solid base for a game but I would like to see some tweaks in the gameplay.