This is a very cool entry.
It took me a while to figure out what was going on because of the low res but once I did I had fun with this game. However, I did find it very difficult, specifically because of limitations in placing my soldiers, I felt like there wasn't a ton I could do to bolster the defense of one of my mines and I didn't quite understand if I was supposed to be able to move my soldiers or buggys/bikes. I did get a cannon down in a great position on level 1 that went to town on the aliens though, and that felt great haha.
Visually I think it looks fantastic, especially with the lighting effects and all the different colours of soldiers and aliens and projectiles around the screen, and the music is atmospheric and engaging.
I think there is a cool game here, it just needs a bit more polish to make it clearer how to play, but the core concept is really fun.
Great job!