Wow, that's a very fast sprint time for that mode! I prefer 20 line sprints, and was only getting around 2 min.
Not sure what controls you used, but my platforming muscle memory felt more natural than my usual Tetris controls. I also didn't get that brief moment of key binding jet lag when switching back to playing standard Tetris with my usual controls.
If I decide to polish the game, adding a way to test the controls in the main menu is high on the list.
I agree that time attack/trial mode has more potential than what I implemented, and 2 min is sadly not a lot of time to do anything with this format.
How it currently works is you get a set amount of points for the type of clear (single < quad), a multiplier for consecutive line clears, and a bonus for the time between line clears. There is also a large bonus for an All Clear, but it seems really difficult so I can't remember if I even bothered adding an animation. Without spins, it really limits the possible play styles.
Maybe with a better or more complex nudge mechanic there could be ways to make it more interesting. Currently, the mechanic can be more of a hindrance than a tool when playing quickly.
I don't know, maybe it's just not a mode that's really compatible with this format. I think variations on sprint and survival modes naturally work a lot better.