This is a very nice spell though i think you may want to add either more damage or more blast at higher levels.

You may want to remove the 1d4, as basically no cantrips still damage on a success

I agre

- cantrip should not deal damage on succes

+ The push Is just good enough

- No cantrip scaling is a issue. 2d6 on lvl 5 Is ok to add and so on.

Oh cool

I agree about level scaling and no damage on success. 

As others have said there is no scaling with this cantrip, which presents an inherent problem of usability at levels higher than 4th, and it should do no damage on a successful save, there is no official example of a cantrip that does. You also need to specify the type of damage the spell does, for this I would personally suggest force damage.

Other than those things I think you have a nice cantrip here, with a good amount of uses if one is creative which is something I always think is good to have. Once you fix those issues it would be a great spell for almost any caster build.

Worse thunder wave if it was a cantrip.