66600000 points exactly when i completed on easy lol. health packs are the best upgrades, and freeze time is good as well. Everything else is decent at best. focus on shot speed, then armor, then bullets and power
@Milo210 : If laser is fully upgraded, pulse could already be fully upgraded. Level 12 also seems to be OK for getting extra cash and that is rocket friendly
The secret upgrade turns you into toss the turtle the first time u hit the ground, and u get 2 bounce for a bit! Not worth the 3,000, but still pretty cool!