Excellent game 6/5 if i could give it that for a noobie programmer! Pretty straight forward game-play, only one suggestion, maybe a epilogue of a few fights just to level the last of your characters up if you missed a few before.
just a strategy for those who don't really have a talent path yet, i don't and have the function of a 'kill box' for the kitchen of placing 4 rocket towers in a section where there is enough room for a 3x3 grid. place the towers in the corners allowing 4-way access/escape routes for you and your goodie little rocket towers and personal rocket launcher
"Oh darn, the lights broke off the celling, I guess I'll have to fix them, the blood from my newly appointed 'friends' are a nice decorative touch though."
Heres my strategy for the last level (may need to use pause for building in stages:
Build collectors straight to the top and branch out at top with 4 blasters (two on each side)
Then you branch out with economy then build some sam sites for spore protection then go on from there, With that I beat it in 23 min.