I just released a mobile web version of my game, both it and the original are totally free.

https://chupiperasaurio-studios.itch.io/specimen203-mobile

https://chupiperasaurio-studios.itch.io/specimen

It is a fast-paced platformer oriented towards really good optimization and level and game design. It is a difficult game, but it is meant to be played by even people that don't usually play games.

Aproximate duration of 30 minutes.