Leave Me a Clone
You are an alien... an alien who does alien things... like making clones of yourself to use as jumping points for hard-to-reach platforms. Yep, that pretty much sums up Daniel Haslop's puzzle platformer, Leave Me a Clone. Move yourself around with [arrow] keys and use [X] to create a clone of yourself, which creates a block wherever you are, even in midair, then starts you off at the start of each level as a new clone. Each of the 35 single-screen levels has you collecting the required energy orbs, as indicated in the lower left, to open the portal which will take you to the next level. In your way are spikes, shooting enemies and gravity-defying plants.
If this doesn't create enough of a challenge, each level has varying requirements to earn up to three stars. The highest tier involves using a limited number of clones of yourself, so if this is your goal, be prepared to perform precision jumps or else face restarting the level. Regardless of working toward the coveted three-star status, you'll find yourself restarting a level often (whether voluntarily or not) as the high difficulty of Haspo's creation will likely confound you at some point. And if you can complete all the levels without rage quitting at least one, then that makes you a better gamer than a certain JiG reviewer... Not me of course, geez!