Here are all the limitations of the Demo
only 5000 mana
only level up to a ten
Only the two levels which are the level and the challenge for the level
Not allowed to do public online matches
Only ten pages in item box (full version gets 14)
Cannot do hard, insane, or nightmare difficulties which means you can not get the better weapon from doing the challenge on insane.
What I did to make it more like the full version was I hacked my mana and bought the pets and then it lowered me down to 5000 but still let me get the pet, then I hacked my hero level to a 70 so I could use my challenge unique item and my unique pet from making it to survival wave 15 on medium difficulty. And i used cheat engine for hacking (Watch videos to find out how to use it).