A claymation art design turns a rather easy shooter into an interesting adventure, but limited panorama detracts...
The gameplay of Platypus is pretty standard shooter fare. You blast at your enemies as they fly by, and there's a decent array of enemies to boot. When you destroy bigger enemies, fruit flies from the wreckage which will give you extra points when you grab them. Power-ups are frequent too, though since they only last about 20 seconds, you'll need to keep grabbing them to keep your weapons primed. The combat is pretty simple, however, despite the different difficulty levels you can choose from. Nothing shocking, but nothing incredibly poor either.
Visually, the game has a very distinctive claymation look. All of the art is clay-like: the backgrounds are claymation hills, the enemies are claymated even when they explode in a clay goop, etc. The visuals are colorful for the most part, and the aesthetic presentation is fun and interesting at least for the first hour or so. After a while, however, you'll notice that there's not a whole lot of different environments to experience. Since, for all shooters, the combat is pretty much the same throughout the game, what space-shooters really need to elevate their level is a variety of environments, enemies, bosses and challenges, powerups etc. This is where Platypus falls short - what is a nice aesthetic becomes repetitive, and that's probably when you'll get tired of playing. While I understand that the artwork took a lot of time and would be time-consuming to duplicated in multiple different ways, it's needed to hold one's attention.
Bottom Line: Platypus is a decent shooter, but its easiness and repetitive level design hold it back from being a strong space-shooter option.