Best game I've seen on Kong in a long time. A nice feature would maybe be that you can start out at higher speeds, because the real fun starts at about 500 speed. Maybe make an option that you always start at half the speed of your best run?
level 4:
1. Build a salvage yard before making units
2. Send 1 shovel guy to be just in time for the first zombie, then 2, then 3
3. Send them in groups of 5 and build more salvage yards when possible
4. When the fast witch-zombies come, allow them to smash your base before you kill them, this way they will damage your base and not your units
5. Before building the final salvage yard, build a trailer and send shovel guys in waves of 10
6. The 1st fat zombie will come, dont make any units, but send the harvester when he is close to your base. You should have all salvage yards by now. Use the time the harvester gives you to build a farm
7. More fat zombies will come, use shovels to delay the other zombies until the fat zombies come. When the first is close to your base, use airstrike
8. Use the time the airstrike gives you to make a garage and survivalists
Remember: use yeehaw powers to buy time, send survivalists in groups, save up for a priest
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On my list to do! Thanks for commenting :)