Thanks for your constructive feedback! It will really help me to improve :). We can consider all games like first drafts of potential games in the future so any opinion is more than welcome and appreciated.
Actually, I am thinking of just removing the right-side circle which seems to bring more confusion than explanation. And give some indication on the player itself (rotate, shape, colour). I will think about key access to make it more convinient for users to play. Maybe just some finetuning will help a lot.
Concerning Twitter, my intention is just to start creating some content & community for my account that I would like to use in the future for other developments, not only advertising the game but also sharing some pictures of the process itself. Practically, I got 11 access from twitter (4 access just yesterday), which is something already and I guess the more community I have, the more people could join from Twitter,.
I will pass by your game and check it out later!