way too much reliance on the physics engine when trying to push with a long string,and 18 takes way too tight of timing for a puzzle game with way too many things that can go wrong. Other than that, not bad.
I doubt you're still working on this project, since it launched 3 years ago, but I probably woud've added a reset to platform button on the pause menu as well as something that lets you regain the special hit after something like 50000-100000 gems. Just some things to consider in cae you make this type of game again.
"wow this game is terribly balanced" i thought to myself as i unlocked double guns and napalm bombs, turns out i was wrong, as i unlocked triple guns and homing missiles. it's fun and i did play the whole thing but by the end i just had an infinite death ray that auto locked onto all enemies.
this game is poorly optimized for pc's without touchscreens and i was about to earn the badge of the day when my game decided to open the developers website.