The assets are nice. cant quite see where you are going with the idea, the game is very buggy and the music is a bit annoying. On the technical side: make shure the game checks if an object exsists before you check any of its varables.
f.eks.
if(instance_exists(obj_warp)) {execute code related to the obj }
else
{
maybe spawn the object that is missing or something.
}
also made a gms game if youre intrested. It has some bugs as well; https://itch.io/jam/gmtk-2018/rate/301335