On some sites it says "Press `~` and enter the codes -> e.g. fly, god". But this doesn't work on my machine.
Does anyone have a copy of the game where the cheat codes work? I'd be interested in the FLY mode.
GOD mode can be achieved if you edit Objetos.bdd and set .MODO_COLISION from 1 to 0 (I guess this removes the collision model from your player and the enemies can't hit you anymore).
The 3 playable characters are: