Thanks for playing!
Our initial play-testing showed that even this start speed was too fast for some people. So we added a feature for better typers that you could try to "outrun" the screen and push it upwards for bonus points - meaning chasing the high score on the leaderboard would be fast from the get-go! We did not really have time to explain this well in-game. So to break it down - push the screen up for 10 bonus points. Every 30 seconds the speed ramps up. It gets hectic quite fast after a couple of speedups.
Regarding the inputs - I am pretty sure the input detection itself is lightning-fast and updates every frame but there is probably a bug that we detect multiple inputs at a time. This means that if your key inputs overlap then it would probably detect both and end up messing up your word. If this was a full-fledged game I'd handle the inputs definitely better so great input, thanks!