Hey there, saw that nobody replied yet so decided to give it a go
I read the "how to play" sections and a bit about the lore and got into a single player game right away. I generally felt that the sound effects, movement and screenshake effects were done really well. Personally I felt like the gameplay was quite good and it was somthing that I actually enjoyed to test out.
However I feel that the question marks on the enemy units and their unknown values can sometimes be a bit frustrating . If I were you, I would add some type of "fog of war mechanic" where the values of the enemy units can be seen if they are in a certain range.
Considering this is just a beta, i think overall its quite good. It just needs a bit more visual polishing (maybe making the units look like actual soldiers not just circles for example and the ui as stated in ur post)
I was very pleasantly suprised. This is a great game so far :)