Cool game, I felt that the upgrades seemed a little disjointed. The image and the effect did not seem to be correlated. I really liked the tornado mechanic. Nice!
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(Dunno why but my first reply is still pending even though it's been two days... so here trying to send it again.)
there was still some bugs with the upgrades i was battling with today, should be working properly now, though I'm still bad at balancing. I confirm the images do not determine the effect. Who knows what it's in it... Never trust appearances :D