Alright, lenghty review here.
First thing I noticed is that there are no instructions to this game, which lead me to confusion over the HUD.
Second is the inertia. The idea was very good, but your inertia was a little too intense for the game in respect to the screen size. Some of the bars (especially the enemy counter bar?) would extend out of their space and the upgrades system was faulty. Gameplay was fine however and the controls were not glitchy. 3/5
Really enjoyed the game! The game was a little boring at first when I didn't get the hang of it, but once you do, it becomes a very interesting game. Very difficult, but stop complaining about how difficult it is. 2nd time around i completed the game without losing a life. 5/5 for me.