Very fun Alex, I think it would've been nice to have a graphical UI, at least that would be my preference over keyboard controls and having to hold a key to draw a normal line felt a little non-intuitive to me. Also the rider seemed to go very fast, perhaps a little too fast in my opinion as it was hard to control and limit his movement.
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Thanks for your review, sorry I am responding well over 3 year later, I hope everything is great with your game development projects. I did made an update to the game couple months ago and added more user friendly interface and also fixed the physics bug in the rider's code and now the character does not goo too fast . I also made the game open source and it can be opened in Unity game engine.