This is awesome! I had this moment of high tension early on where I was totally surrounded and was sure I was dead, but then I suddenly got a little power spike and was able to get my head above water again. The build up of tension and relief was A+ (At least for my run)
I love the sprite work. The pseudo 3d looking 2d sprites reminds me of old-school blizzard games, which is what you were going for, I think, considering the resemblance to Starcraft.
There's this one golden rule in game design that I always like to keep in mind - There should always be a reason not to hold a button down. For ThinkTank, there's never any reason to let go of your 2 mouse buttons (at least for the weapons I chose). I think a good solution here would be to just have the guns auto-firing and the player just has the control the direction of fire with their mouse, or ammunition should be some kind of resource that you need to manage do incentivize not just holding down the shoot buttons.
Great game, well done!