A great relaxing game ruined only when the phone rang and there was no pause, ruining my 9 bird streak. Another idea is a reset for when trying to get the acivements due to the fact that you need to finish the game or refresh the page. Even without those 5/5.
Great game! but some of the controls like the dash were useless, the stupid meteors and reflection kept messing up the "only one weapon" challenges and I kept accidentaly clicking on a random perk when I leveled up so 4/5 but apart from that awsome. Make dash double tap, stop the meteors and reflect stopping the challenges, mabye let people hold onto perks and not always pick one and make a level up screen AFTER the battle for a 5.
Mabey in the next one you could add different enviroments like some where he starts in the bottom of a valley or at the top of a hill. Would be great with natural enviromental disasters to exploit.