nice game 10/10,but you should upgrade your weapions or something like that,
and for those who are going for level 40 in survival ,first buy all ipgrades for help.
awsome game my last achievment was 16 swans in flock,then i read some comments and saw that if you restart the upgrades you will get all your money back,i thought i'd loose everything,anyway if those are gone : reset upgrades for the 16 swans and dont buy homing beackon ,buy all other stuff to help you through it,well hope it helped
---------------->plus if it helped