Great look, but the upgrades are a bit messed up. You really need to grind for cash and it becomes a big chore. Additionally the upgrades themselves are really funky. I've upgraded both the plasma ball and the Laser to the max and i still seem to have an easier job murdering enemies with the inferior Plasma.
Coupled with the other comments about the H-Bomb being crappier than the cluster-bomb, it's tough to know what weapons you should really go for.
Game looks great, plays fine but the grind makes it quite unappealing.