If I would rate games, I would rate this a 5/5 just because some people rate this 1/5 for having no mute button.
The game itself isn't really interesting, a bit buggy, and quite unfair as well. Pause should be unlimited, for example.
Okay, I'm in this level where my mouse has to go to "play" first, and then to the button to catch the bubbles. That's not fun. At least let them drop onto a brick first.
You should never make it so to guess where a machine part is and if you didn't guess right, you will never be able to get it again. I'm referring to the part with a machine part where if you don't blindly jump to there, you can never jump back up again.
Some levels end before they even started. And in some levels you die before you know what the heck is going on? Nice principle, but it didn't work out that well.
It's all right, but a little frustrating. For example, you don't know when the automatic gun is at the point where it can fire endlessly at you, or when it's just aiming the other way. Or dying instantly in spikes.
The helicopter is impossible at the moment, I didn't upgrade anything except my weapon, shot at the helicopter every single second of the game (while getting hit left and right by missiles, because I didn't have time to focus on them) and still lost in the end. Do the other weapons deal that much more damage?