A visual feedback to know which unit you have selected would be a nice addition: right now, you don't really know if you have selected them or not, especially when you just click to select one.
Maybe show the life on the different units, many times I did not understood why my unit died while it had a better attack than the enemey (and they spawned around the same time) so showing the life would be a nice addition
The RNG at the beginning is frustrating as hell: how do I do when my 4 units I begin with have around 50 when the enemy has 3 around 70 and 1 around 50?
Finally, the art and the audio were not great (for the music, quickly repetitive) and you notice it even faster than usual as you quickly focus on the game's downsides.
On a brighter note, the idea is interesting and could lead to a cool game.
Overall, it is not a great game but RTS are really difficult type of game to create and you did a good job doing one in such short time. I think if you can adjust with all the feedbacks you reveived, it can be a cool game.