Totan need a new code, for sure.
My single suggestions to increase wizard mode:

1 - Sinbad and Rocks - more bumpers hits, 10 or more, not only one.
2 - Scheherazade - Shot only one gold symbol to complete in 20 seconds is too easy! My suggestion is 4 or 5 shots in 20 seconds. If not completed, sorry try again.
3 - Flying carpet - Only one ramp shot is too easy! At least 3 ramps would be good or alternate with everything.
4 - Cyclops - Only one captive ball to hit!? No, at least 5 hits would be good.

The other modes no need to be changed, imho.

If possible to implement a video mode, a new way to get haren mb, or increase difficult to collect jewels by lamp would be good.

The genie battle no need to be more difficult. Terrible is a game when you can get close to finish and you loose most of times, this dismotivates everyone.

PS. The wizard mode of Scared Stiff would be the next in my list.

I'm not, but as we say here, hope is the last to die.

Greetings!