2d games are awesome,
pixelart is more accessible to learn than 3d modelling
due to the low barrier of entrance on this site there are many, many 1-man teams and amateur developers, who just can't manage the workload of a 3d game
but as others already have stated, there are 3d games on the site. (the stuff by Siactro [ https://siactro.itch.io ], for example, which I very much enoy) But maybe a filter option for it similar to input devices and all that would be a good idea