Reactive is a mix between a 2D shooter and a puzzle game, reminiscent of games like Earthwork Jim or Battletoads on NES. Using your keyboard controls, you have to move around and attempt to survive in environments that, because of slightly pixelized graphics, look hostile and crowded. Your 2 legged chameleon can aim around and shoot enemies, but you have to wait for the clockwise motion of your aim to be focused on your enemy to shoot it. This and the number of obstacles present in the game make it fairly difficult, even from the start.
The originality of the game also resides in the unexpected reactions that you get from materials, like water or gas, that come into contact. You can sometimes use these reactions to your advantage to get through a level. As you progress through the game, you'll also know how to detect potentially dangerous reactions.
Reactive is certainly an original game. Although the graphics and game mechanics are not always excellent, the difficulty level and unexpected chemical reactions make it a real challenge.