Yes, the target level limitation only applies if this is marked in italics in the spell description.
For example, some spell affects that could harm/constrain an opponent may need to be cast at a higher level to succeed (more effort required to affect a higher level target and it avoids a situation where low level spells can be spammed to defeat a tough opponent). Where the effect is beneficial and welcome, this tends not to apply.
Thanks for checking out the game.