Thanks for the feedback. I had a lot of ideas how to make the game fitting the theme more, e.g. that player blue can heal the base of the other player. But I didn't have the time to implement them.
I also wanted to make the player move with keys and rotate with the mouse. But how to implement that on one pc? And I didn't know how to make a multiplayer game for two PCs.
But after all I'm satisfied with what I could achieve in such short time