Simple answer: no.
Music sheets are what you want to use, because they contain much more information than just showing you which notes you need to play in which order. For example time signature, tempo markings, dynamics, etc. etc. etc., which are all not included in synthesia.
Once you get used to sheets, nothing else is acceptable anymore.
Btw, I think you should play something else than the HR 2 if you haven't yet gotten to the point of using sheet music. I can't say for sure, because I haven't played it myself but henle lists it as level 8, so it's certainly not a beginner piece (I'm just assuming you are one, I could be wrong ofc).