To compensate the lack of content, I did it in the old fashioned way: ramp up the difficulty
How it works:
- You get energy points by killing enemies
- With enough energy points you get a new tower
- Each new tower is more expensive
- A stronger enemy has a random chance to spawn
- The chance of strong enemy increase with the number of towers available
- Goal: survive 3 minutes (it’s possible if you are quick at the beginning and a bit lucky with the Random function)