For me it's emotional factor. And what causes good, positive emotions - the combination of all aspects. Visual, sound, gameplay, ux. Unfortunately your game did

For me it's emotional factor. And what causes good, positive emotions - the combination of all aspects. Visual, sound, gameplay, ux. Unfortunately your game didn't work on my device. To give an un-biased example: there's a great puzzle collection on F-Droid calles just... "Puzzle" (many in one). Lots of classic puzzles there from sudoku to minesweeper but... I'm not inclined to share it.. yet. Because while puzzles are ok by themselves, 1) the graphic design and "eyecandiness" is zero, 2) no catchy sound as well, 3) there's no motivation to play any puzzle again - no even single-player score board. It gets boring after one or two successful matches. On the other end, looking at commercial japanese games make me feel "Wow, this is cute/amazing/beautiful/clever/well put/etc. I want to show this to my friends!". So, human trials are a must if you're not confident as a designer. ) So, any game can be boring or viral totally independently of the gameplay itself. And people don't share boring games, at least to not to look boring themselves =) PS: OK, I should confess I'm somewhat related to game development.