Well I was thinking about survival mode with a bunch of my friends in the game as well, and this is the idea we came up with:

Survival Mode (Cost 200 Crowns to Enter Per Player):

Modes: Solo

Party (Guild Only): Meaning only members of your guild can join the party option

Rewards: Heat or have it be just like all other Pvp in this game Krogmo tokens.

How it works:

Its basically doing a run:

You pick your gear set, and once you click join your locked in you can't change your gear at ANY POINT in the run. The waves are all random (the dev's I am sure can make coding to help out with this idea):

Wave 1 to 5: Mix of two monster types

Wave 6 to 10: Mix of three monster types

Wave 11 to 15: Giant Jelly King, Ice Queen, or Snarby (which you can not kill) can appear (On any one of these waves) along with a mix of three monster types.

Wave 16 to 25: All Monster Types, and have Auto-Gun Puppies (Fire, Rocket, Shock Etc.)

Wave 26 to 75: Auto-Gun Puppies All Monster Types and Giant Snarby (like the one from Shadow Lairs) running around on top of having blast blocks randomly in the map along with spikes.

Rank System:

You are ranked on the # of waves you beat or your team beats.

1 to 10 Is based on the amount of waves you or your team cleared.

Example of Ranks:

1. Bieberfever --- Wave 75

2. Dogrock --- Wave 69

3. Cobalt --- Wave 35

4. Bsowick -- Wave 21

5.

6

7.

8.

9.

10.

Etc.

Guild Ranking (Team):

1. Echo of Sausage Wave 75

2. Echo of Sxyness Wave 71

3. Echo of Stupidness Wave 70

4. Echo of Friendly Person Wave 69

5. Echo of Saphy Wave 65

6. Echo of Boswick Wave 45

7. Echo of Sucks Wave 40

8. Echo of Sound Wave 12

9. Echo of Pie Wave 11

10. Echo of Silence Wave 2

If you do wish to have more detail I can gladly post and will take any questions which are meant for this topic as well.