Thank for giving the time to give quality feedback, we really appreciate it. I think the max speed could have been increased a little bit, but I think the main problem was probably the initial acceleration is really slow. There isn't a hard speed cap in the game, there's a limit at which a drag force is applied, so with dashes you can break that limit. I think the biggest mistake was not allowing players to plow through walls at higher speeds.
For a post jam version we want to do snappier better movement, but still maintain a sense of gaining momentum, definitely want to do tons more ability ideas and I agree with your dash ability ideas, some things should be tied to destruction others should be timers, and others should be limited time use per a level.
I'm glad you enjoyed the game!