It is one of these times that you really want to brake the pc...D:<
I spent almost half of the week trying to fix the generation of Power Ups and i gave up.
The power ups were supposed to come after the destruction of all the ships of a wave but i couldn't figure out a proper pairing algorithm that works...
So now i go for the score Power Up approach (and a timer).
The Power ups now have a basic floating effect, which for those who may be interested is made with by sclaing them.
The game now looks less glitchy and i made a small video for you to check if you don't want to download.
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AftPeakTank 
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