RobotEx is a mixed bag when it comes to reviewing. It's not an amazing game, but it's not a bad game either.
This is an automatic side-scroller with very little controls, as it was obviously made primarily for a portable platform. Pressing the spacebar makes you go up, letting go makes you go down. The only other key is P, which fires your forward rockets. When you first start the game you're given a controller config screen, which seems to be a bug as the controls are hard-coded into the game so the config screen is somewhat pointless. Once you figure out that there are only 2 hard-coded buttons your control issues come to an end. (unless you're one of those spoiled individuals who has to have complete control over their key configs)
Starting out with the graphics, they're pretty detailed and very nice to look at. I'd say right along par with other games in this genre. My only gripe here is that initially it can be difficult to tell what's going to hurt you and what isn't. This can lead to a few accidental deaths, but as you have unlimited lives it's really not a huge hinderance to the game. Once you figure out what things will hurt you it's not too difficult to spot and avoid them.
Sound in the game is pretty much whatever is absolutely required. There isn't really any music but there are action sounds (rockets firing, explosions, etc) that will keep your ears from getting bored. Again, the sound that's included is well done.
The menu was a bit of a mixed bag, as it was obvously developed (again) for a portable system. You have 3 worlds (colored file folders) to select from on the left and those give you the various levels available (1-1, 1-2, etc.) for you to select. Clicking on a level begins said level.
I'm a pretty intellgent person so figuring out the "story" wasn't too difficult for me. It's presented in the form of cutscene-style video, but as there is no text or voices to the story it's up to you to figure out what's actually happening. From what I understand, the world has come to an end and a fleet of ships has set off to find a new home. You are therefore the explorer of these worlds.
All in all the game could have been ported a little better for the PC. It could have included a menu screen showing the keyboard commands (which you now know). It could have been better fitted to the window. They could have removed the on-screen button graphics, obviously used by the portable version. There's a lot they could have done... That said, I rather enjoy this game as a quick time waster as it doesn't take a lot of time to start and play a level.
If you're spoiled with controller support, custom controls, and perfect ports than don't bother with this game. That said, if you can see past it's rough ported edges then this game is going to be enjoyable for you. At only $2 I'm certainly gonna recommend it.