Yeah! Kill all flappies! Finally somebody invented a game like this! ;-)
Only few complains:
1. I assume that it is made mostly for mobile devices, but if yiu release a flash version playable on PCs it would be good to consider hotkeys for using bonuses, like 1, 2, 3 buttons for example, because sometimes you really don't have time to click on a power-up to activate it. Or maybe even make an option enabling them to be used automatically after obtaining?
2. Sometimes for a longer moment after the cooldown even if I click the machine is not moving, seems a bit stucked;
3. Once I encountered something weird: one of the birds after bouncing from the wall just stayed in the air, not moving in any direction;
4. The upgrades aren't much of a help since they are placed in only one spot on the stage, not applying to the whole wall.