Yeah, we decided to keep the modules simple for the jam, we really wanted to do some more interesting stuff with them (We had a sword to return projectiles, but it was somewhat buggy, a bit hard to balance, and time was limited) but in the end we decided to focus on other things, like the bosses, all the UI, etc.
About the jump, yeah, the short jump is not that useful from the ground most of the time, however, we felt it was useful for when you needed a small redirection while in the air (Also, maybe our love for short jumps comes from a looot of hours playing Smash Bros haha). I personally felt like I used it a lot in the 2nd boss to dodge the blades coming for me while I was already in the air.
We'll experiment with it after the Jam, since we hope to further develop the modules and add more bosses with more interesting modules, thanks for the feedback! Glad you liked the game!