Sibling comments are correct, on review, that it seems you can work around it by holding down in advance.
Unfortunately by the time I verified that I had run out of time since I spent most of what I had trying to make it work on my own before returning to the thread to offer this feedback.
Personally, I think the idea is good enough that I will try to return on desktop later when I have time… but for the devs - if you read this - you could really enable a lot more people to get a lot further in this presumably great creative experience if you made the controls respond better on mobile.
I tried it on keyboard and it's a bit more playable, but frustrating for players like myself who more than have the dexterity to press exactly when I want to.
A+ for humour, artistic style, and concept... D for play-ability.