Spend your coins on weapons upgrades instead of explosives.
Various Google Play Achievements
Achievement
How to unlock
Almost Dead (2,000 XP)
Survive 15 levels with 10% health or less.
Ants In Pants (500 XP)
Switch the radio station 10 times in one level.
Assassin (2,500 XP)
Kill 1,000 monsters.
Beaver Head Problems (2,000 XP)
Take off 100 beaver helms.
Bug Infestation (1,000 XP)
Let the bugs shoot you 100 times.
Burn Them All (2,000 XP)
Burn 20 enemies with one Molotov.
Call Me Rich (2,500 XP)
Collect 100,000 coins.
Exterminator (5,000 XP)
Kill 10,000 monsters.
Feed Cousin Roy (1,000 XP)
Cousin Roy has to destroy 100 flying creatures.
Flying Oil Can (1,000 XP)
Shoot the Oil Can while it is in the air.
Grinder (2,000 XP)
Finish a single level 10 times.
Handyman (500 XP)
Buy wood to protect the house.
Hunter (1,000 XP)
Kill 100 monsters.
I'm too Good (2,000 XP)
Survive 15 levels with 100% health.
M-M-M-Monster Kill! (3,000 XP)
Finish Episode 3.
More Power (2,000 XP)
Upgrade 5 weapons to maximum.
Mosquito Busters (2,500 XP)
Finish Episode 2.
Multishot (1,000 XP)
Kill 5 enemies with shotgun in one shot.
Never Giving Up (1,000 XP)
Lose level 5 times.
Pest Control (2,000 XP)
Finish Episode 1.
Pocket Money (1,000 XP)
Collect 10,000 coins.
Power Maniac (4,000 XP)
Upgrade 15 weapons to maximum.
Power Up! (1,000 XP)
Upgrade one weapon to maximum.
Quick Mission Rookie (1,000 XP)
Win 20 Quick Missions.
Quick Mission Specialist (2,500 XP)
Win 150 Quick Missions.
Quick Mission Veteran (5,000 XP)
Win 500 Quick Missions.
Shoot First, Ask Later (1,500 XP)
Kill 1,000 enemies with Minigun.
The Art of Persistence (2,000 XP)
Lose the same level 10 times.
Tycoon Power (5,000 XP)
Collect 1,000,000 coins.
UFO Incident (3,500 XP)
Finish Episode 4.
UFO: Survival (2,000 XP)
Finish UFO level without shooting down any UFO's.
Use It (1,000 XP)
Use Atomic Bomb.
X-Ray (2,000 XP)
Kill 1,000 enemies with Alien Gun.
Weapons
Do not spend coins to get weapons or explosives. They will naturally become unlocked as you complete levels. Save your money to spend on upgrades.
Use the shotgun often to get easy multiple kills. Tap somewhere between a cluster of monsters to increase the chance of damaging most of them.
Use explosives only when needed and when they can target as many monsters as possible.
Switch between weapons as needed, based on their range and most effective use.
To reload more efficiently, allow your main character to reload one bullet before you shooting. If you shoot before you completely reloading one bullet, you will reset the timer. Shoot as soon as the previous reload is done for maximum efficiently.
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