I was thinking that for making it less repetitive he could make upgrading to different types of towers a thing instead of just upgrading speed and damage. This would make it much more interesting and drive the player to keep trying so they can see what the different typed of towers they can unlock are. These towers could also have much different ways of firing. This game could really be taken quite far. I hope he continues to work with it!
Viewing post in Tower Madness jam comments
I definitely wanted to add more to the game, but started running out of time. I barely got the upgrade system in place. I had planned on making a few more activities, like repairing the tower, fighting enemies inside the tower, full upgrade menu with different upgrade types, changing ammo locations (some one runs in to the tower and drops of ammo in different locations each time).
I'll pursue this idea for sure, so stay tuned!