I loved the concept. Very nice and smart levels. The game was fun, graphics are very cool, music gives an appropriate ambient and the characters are very nice. 5/5
For the Combustio and Juliet badge, prevent machines coming from left from crashing against those coming from right. Hourglasses power-ups and Lvl 2 Gravity Manipulator ability make a great combo. Also, the pink missile (the one that appears when you buy for first time a Proyectile upgrade) is useful too.