Could make this a mobile game by adding a few more gameplay elements, like having the blocks move at some point, like every 5th stage as sort of a "boss fight", perhaps in just a small area that increases with each "boss fight", and maybe time attack levels. Maybe levels where instead of the walls closing in your character grows. How about levels where the stage slowly goes dark and then goes light again? And stages where there are blocks you have to avoid, such as blocks that give you a game over when you touch them, or blocks that are walls themselves. Maybe introduce one of these each 5th level to keep people guessing what will come next so they'll play longer. And then after all the ideas are used up combine them. The closing walls could just be one mechanic that is used as the main one used on stages between the "boss battle" stages. Also, sometimes my click and release isn't registered, but input dumping even happens in AAA games. Oh, yeah, 32. Actually, 36 now, and just found another bug: it shot me straight up or down, even though you can't aim straight up or down.