1) Annoying animations break the flow of game (getting stars, fuel, butterflies after the puzzle) while your timer for bonus rockets (20min) is still running out 2) caught butterflies disappear when you close or switch the app (annoying when game crashes or turns off) 3) if you go through levels fast and catch butterflies, the prizes don't sum up, you have to wait for them to activate after x minutes, to be able to start waiting for next one 4) train sticker tour got canceled 60 days before end