> For some reason, the game makes me start at level 2 speed. maybe you could start at level 1 or even level 0 speed?
The button is more like "Buy level 2 speed;" it's implicit that you're at level 1. I don't know how much this actually matters.
> Not being able to spin a piece when it is touching the border is a little rough
In the in-dev version, doing achievements allows you to progressively unlock piece kickback!
Your other thoughts are interesting too, though I have no comment for them, thanks for sharing!
Maybe I'll start developing this game more seriously again some time. I have some other cool projects in the works, though!