Originally posted by BeatMeTheFreak:

We played allready 1 or 2 years ago. And the enemys just to low^^

Ohh, then there's really no other way than just hp inflation like I and Rhapsody said. You can try maybe making the hp multiplier beng x4 even though there's only 2 of you in a world (rather than the normal x2)
Otherwise, the alternative would be putting restrictions on yourselves or doing some sort of challenges.