Its fun to play in the tundra and have each level be harder than the last, but I was thinking it would also be nice to add more expirance the further you go. I'm thinking the monsters give a 5% more expirance the further you go.

The Tundra is only here because of an event. After the event, it'll all be gone, so there's no point.

I disagree with you SuperHappy, griphonlover raises a good point. It's true that the Tundra is a temporary addition to the game but it appears that it should be expected to be an annual feature that will come along each Winter season. It isn't an event in itself, the BK "lore" just says that it is not profitable to keep the portals functional outside of Winter due to the warmer weather during the rest of the year.

In any case I find myself agreeing with griphonlover here; the monsters get gradually more difficult with each level so it would make sense for them to start giving more experience the deeper in you go. Not much but some to help the harder exploration be worth it more. After all, you could spend your energy on low-level islands where you can definitely beat the monsters or waste it getting stuck on higher levels with the experience gained from winning being the same in both scenarios.

I was rather disapointed last year when I realized that higher levels didn't give more XP.