Rebinding the A key was one of the ideas we had but we run out of time for. I was considering a spacebar, but a spacebar is a big button and it feels somewhat flaky to press (at least on my keyboard :D) so I've just stuck with A. I'm left handed so that checks out!
And obviously, THANK YOU SO MUCH and I really appreciate the fact you love this game!! (I almost bursted into tears when I was reading it!) I will make sure to update it with the cut content (due to time constraints) as well as bugfixes and new levels! :D