Wow this was ambitious for a jam game. I loved that you attempted this genre and it's the only one I've come across so far. I really liked that you spent time building a world and story behind your game to get players invested. You've done a really good job using the asset pack to make all the different units.
I admit this isn't my favourite genre of game, so I did find combat lasting a little too long for my liking. I think the UI could use a little bit of polish too, but you had to do so much UI work in a short amount of time I feel bad critiquing it.
Overall a really good entry, nice job.