You are in :Bloons Monkey Games
After playing only first level it came clear that this is a rip off of the Ninja Kiwi's bloons series.
Monkey King here is used just as a background story, also a rip off of an old chinese legend about flying super-monkey named Sun. We had him on two occasions already on monkeygamesworld.com . Once in Monkey King and the second time was in the sequel Monkey King 2
Controls are basic, as you only use a mouse, to re-position the arroe and mouse click to shoot the arrouw out. I've found using space bar useful only in occasions when several rows of red ballons come along, as you would want to skip those, so increasing the speed of a scrolling screen in this moments is helpfull, just make sure not to miss out any green balloons while doing that.
To save the game from being trivial, developer put in all kinds of bonuses and upgrades. For instance, blue balloons will win you extra arrows, the bomb balloons pops everything etc ...