With main mechanic do you mean keyboard, mouse control? I put a lot of time on the dragging because I wanted the touch slide on mobile but couldn't make it work. It's really hard, my gf reached level 13 I think lol.
Yeah, with main mechanic I meant how the game is played - its very responsive and works pretty well! I played on keyboard and mouse, and it was pretty smooth.
The puzzle was kinda hard for me, Im not really used to these kind of games and the movement cap was little low (for me)
its a good game, great job!
(also, sorry if I said something in a weird way, english is not my first language lol)