Terran vs Zerg or Tyrannid vs Imperial Guard? Nice game, marred by the fact that it froze upon completing level 5. I also managed to buy the whole shop by level 3 due to replaying level 1 until I could get the best ship then buy the best weapons. Save up for the top level purchase and you save tonnes. Also, reducing angle variation means you have less screen coverage, so I generally didn't bother.
Love the game, the railgun is a bit naff though, the flamethrower is far superior, also, rank up your bumpers ASAP, along with metal shield, saws aren't much cop, nor is the hard wire shell if you're doing it right, you can run over 90% then flame the rest. Double damage can help a bit too.
If you're having problems getting Hero, ramraid the survivor shelters so they hop straight on, or back off and flame anything that spawns in the area till it's clear, then ram raid, get all survivors, clear a path to the exit, find remaining health and fuel, then drive to freedom.
pretty good for a first, people love upgrades and variety, you have the upgrades, not so much variety. Also, people kind of like to be forced into making a bit of a choice with their upgrades, like, do I upgrade speed, better armour, better guns?
Some people like to dodge, some people like to tank, and some people like to deal out the PAAAAAIN!. Give people the chance to specialise via upgrades and they'll play a bit longer.