It appears to be a flash game, simReimu.swf. I've downloaded the zip file, but it's password protected. I found a possible password on futaba, but it would seem that my unzipper doesn't like extended characters...
hmmmm. Hey, Tea, did you only find this picture or did you screenshot it yourself? If you screenshoted, do you think you could post a link to get the game?
@Toawa Password is キリライターさんお許しください as crono already posted ; it definitely works. Game itself is a waste of time , though. Just a bunch of still image Kiraitaa-flavor koreimu roaming the empty void to munch-munch fruits (strawberries?)
@FSB Well... Look - each yukkuri has his own stats (Weight, Height, Energy? [kJ]). If it munch-munch mister strawberries, it will grow. If it's starved and forced to move (for example by clich or to the fruit), it may low his weight, height etc. (My first experiment ended in 20 minutes with 1 11-cm koReimu, 7 6-cm koReimus and 2 5-cm other Reimus.) Now I'm explaining, what will be, if 50 koReimus will be surrounded by glass box and food will be placed outside
No need to explain the game to me , Phor ; I know all that. Takes forever to get a Reimu to a decent size ; my biggest ko reached 13cm diameter , weighing ~600g. Your best bet is to kill all ko's but one (continously poke them for a long time and they will die) and feed that one. Placing berries outside will simply make them flatten their noses on the imaginary glass cage. Large numbers of ko's will bump into each other a lot and finally settle down in a 'grid' of yukkuri stacks (lots of yukkuri in one spot , even though you can only see one). As far as I can see , this is all the game has to offer.
I for once did not intend to bash it. However , as it is now it is barely more than a time-waster - like every other yukkuri game so far (not counting Makako's game because I can't run it).