Ultratron

The last human has been slain by evil killer robots. You are the one remaining humanoid battle droid. Your mission: avenge the human race. Boost your battledroid with powerups, buy cute but deadly pets in the shop. Blast your way through 40+ glowing neon levels, avoiding Chasers, Turrets, Spawners, Minelayers, bombs, and bullets, and take on the four giant boss 'bots of the Apocalypse - Ieiunitas, Bellum, Lues and Letum