Instead of the longer-lasting tumble bonus, make it a short/burst effect that allows you to jump in horizontal/vertical climbing areas, similar to what the jumping beans do. I am not sure about implementation - there are a few options - but Disco was too lazy to post the suggestion so here we are, for the community to discuss!
<3
I always enjoyed using the spell to show off, but I'm not opposed to this. Maybe make it so it does both? On first use it takes you across a chasm or up a cliff, but the tumble bonus stays.
I'm not a big fan of this spell in its current iteration, so this would be a fun way to improve it!
Alternatively, I'd also love to see it work as-is but allow casting on others?
A self cast +tumble has some situational uses, but it seems a bit weak compared to its PnP equivalent where it can be used on any creature