Wow thank you for your answers (and doing my job

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There are five unique levels each one with its respective boss.
There are no power-ups just three different weapons: the standard bullet balanced between power, reach and speed, the spread gun which you know more bullets more reach bus less power and finally, the laser which is powerful but has a limited reach.
Each weapon has its charged attack the laser, for example, will make an energy ball very powerful but very risky.
The scoring system was supposed to be based on the core concept of the game the "2V" an energy source, so anytime you destroy an enemy it leaves behind its 2V fragment which you can get. Anyway, there is a multiplier which adds one every ten enemies in a row (without losing) you start in one, ten enemies after two and so on to a max of ten. The points each enemy gives is based on its life or defense, so if you managed to get to the boss with max multiplier and defeated without losing you'll get a great score.
There were many other plans for this game (upgrades, branching paths, etc) but well things happened.
You can buy a drm free version through a humble bundle widget at
http://2vhoverbike.intertum.com/ (the page is only in Spanish, sorry

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I was thinking in put it for sale in itch.io and gamejolt but I don't know if it's worth it.
Oh, by the way, it was developed in unity.
Again thanks.