You need an OTG connector and a mouse connected to your device to get past the menu, but be warned that once you get past this point you won't be able to enjoy basically anything in the game, as the screen will go black during any sexual animation.
I imagine the lag is because the developer, for some reason, wanted to use a spine-based animation system, which includes .atlas files containing some complicated plugins that are difficult to run even on a computer. This, combined with poor optimization in the script code, makes it almost unplayable.
The best alternative is to get a complete save file and view the scenes through the gallery, if you're on a PC. Unfortunately, Joiplay users will only see a black screen due to Joiplay's incompatibility with .atlas files.